微信公众号随时随地查标准

QQ交流1群(已满)

QQ群标准在线咨询2

QQ交流2群

购买标准后,可去我的标准下载或阅读

This guide covers standard specification for black or galvanized welded or seamless threaded steel couplings for use with steel pipe joints in NPS 1/8 to NPS 20 [DN 6 to DN 500] inclusive. The steel for both welded and seamless couplings shall be made by one or more of the following processes: open-hearth, electric-furnace, or basic-oxygen. Welded couplings NPS 3½ [DN 90] and under may be butt-welded. Welded couplings over NPS 3½ [DN 90] shall be electric-welded. The steel shall conform to the required chemical composition for phosphorus and sulfur.1.1 This specification covers black or galvanized welded or seamless threaded steel couplings for use with steel pipe in NPS 1/8 to NPS 20 [DN 6 to DN 500] inclusive (Note 1). Couplings ordered under this specification are intended for the uses outlined in the pipe specifications referencing this specification.NOTE 1: The dimensionless designator NPS (nominal pipe size) and DN [diameter nominal] has been substituted in this standard for such traditional terms as nominal diameter, size, and nominal size.1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价: 590元 / 折扣价: 502 加购物车

在线阅读 收 藏

This specification covers welded wire mesh fence fabric produced from steel wire or metallic-coated steel wire. The metallic-coated fabric may be polymer coated after fabrication. Welded wire mesh fence fabric is classified in accordance with coating as follows: Type 1; Type 2; Type 3; and Type 4. Tests shall be performed to determine the properties of the material in accordance with the following test methods: metallic coating weight; polymer coating thickness; polymer adhesion test; and weld shear strength of fabric.1.1 This specification covers welded wire mesh fence fabric produced from steel wire or metallic-coated steel wire. The metallic-coated fabric may be polymer coated after fabrication.1.2 Welded wire mesh fence fabric is produced in four types, based on the kind of coating, as described in Section 4.1.3 This specification is applicable to orders in either inch-pound units or SI units. Values stated in either inch-pound or SI units are to be regarded separately as the standard. Within the text, the SI units are shown in brackets. The values in the two systems are not exact equivalents; therefore, each system shall be used independent of the other, without combining values in any way.1.4 This specification references notes and footnotes, which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of this specification.1.5 The following safety hazards caveat pertains only to the test methods portion, Section 13, of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations proper to use.1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价: 590元 / 折扣价: 502 加购物车

在线阅读 收 藏

This specification covers steel welded wire reinforcements to be used for the reinforcement of concrete. The wires shall be assembled by automatic machines or by other suitable mechanical means that shall assure accurate spacing and alignment of all wires of the finished welded wire reinforcement. Test specimens shall be obtained by cutting from the finished welded wire reinforcement a full width section of sufficient length to perform testing. The wire shall withstand mechanical tests such as tensile test and bend test and shall meet the minimum requirements on reduction of area and wear shear strength. The welded wire reinforcement shall be acceptable if the average of all test values across the specimen meets each of the prescribed minimum values.1.1 This specification covers welded wire reinforcement to be used for the reinforcement of concrete.Note 1Welded wire for concrete reinforcement has been described by various terms: welded wire fabric, WWF, fabric, and mesh. The wire reinforcement industry prefers the term "welded wire reinforcement" (WWR) as being more representative of the range of products being manufactured. Therefore, the term "welded wire fabric" has been replaced with the term "welded wire reinforcement" in this specification and in related specifications.1.2 The values stated in SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. (Within the text the inch-pound units are shown in brackets.)

定价: 0元 / 折扣价: 0

在线阅读 收 藏

20.1 For purposes of determining compliance with the specified limits for requirements of the properties listed in the following table, an observed value or a calculated value shall be rounded as indicated in accordance with the rounding method of Practice E29.Property Rounded Unit for Observed orCalculated Value   Chemical composition nearest unit in the last righthand place of figuresTensile strength and yield strength nearest ksi (Nearest 5 MPa)Grain size: Up to 0.055 mm, incl,Over 0.055 mm nearest multiple of 0.005 mmto the nearst 0.010 mmExpansion: Nearest 1 %AbstractThis specification covers welded tube of specific copper and various copper alloys of a limited range of diameters, for use in surface condensers, evaporators, heat exchangers, and general engineering applications. The product shall be manufactured by forming the material into a tubular shape on a suitable forming mill. Welding of tube shall be accomplished by forge-welding, fusion-welding, or full finishing that produces a forge weld leaving no crevice in the weld seam visible to the unaided eye. The tube shall conform to tensile strength and yield strength requirements, and shall be subject to expansion, flattening, and reverse bend tests. Mercurous nitrate or ammonia vapor tests shall be required only for selected UNS Numbers of Copper Alloys. Each tube shall be subjected to eddy-current, hydrostatic, and pneumatic tests.1.1 This specification establishes the requirements for welded tube of copper and various copper alloys up to 31/8 in., inclusive, in diameter, for use in surface condensers, evaporators, heat exchangers, and general engineering applications. The following coppers or copper alloys are involved:2Copper orCopper Alloy UNS No.2 Previously UsedDesignation Type of MetalC10800A ... oxygen-free, low phosphorusC12200A ... DHP phosphorized, highresidual phosphorusC19400 ... copper-iron alloyC23000 ... red brassC44300 ... arsenical admiraltyC44400 ... antimonial admiraltyC44500 ... phosphorized admiraltyC68700 ... arsenical aluminum brassC70400 ... 95-5 copper-nickelC70600 ... 90-10 copper-nickelC70620 ... 90-10 copper-nickel (Modifiedfor Welding)C71000 ... 80-20 copper-nickelC71500 ... 70-30 copper-nickelC71520 ... 70-30 copper-nickel (Modifiedfor Welding)C71640 ... copper-nickel-iron-manganeseC72200 ... ...1.2 The values stated in either inch-pound or SI units are to be regarded separately as standard. Within the text, SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.(Warning—Mercury has been designated by many regulatory agencies as a hazardous substance that can cause serious medical issues. Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials. Use caution when handling mercury and mercury-containing products. See the applicable product Safety Data Sheet (SDS) for additional information. The potential exists that selling mercury or mercury-containing products, or both, is prohibited by local or national law. Users must determine legality of sales in their location.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价: 646元 / 折扣价: 550 加购物车

在线阅读 收 藏

This specification covers electric fusion-welded nickel-chromium-cobalt-molybdenum alloy UNS N06617, nickel-iron-chromium-silicon alloys UNS N08330 and UNS N08332, Ni-Cr-Fe-Al Alloy (UNS N06603), Ni-Cr-Fe Alloy UNS N06025, and Ni-Cr-Fe-Si Alloy UNS N06045 pipe intended for heat resisting applications and general corrosive service. Two classes of pipes are covered: Class 1 and Class 2. The joints shall be double-welded, full-penetration welds. The weld shall be made either manually or automatically by an electric process involving the deposition of filler metal. Weld defects shall be repaired by removal to sound metal and rewelding. All pipe shall be furnished in the annealed condition. The material shall conform to the composition limits specified. Transverse tension test, transverse guided-bend weld test, pressure test, and chemical analysis shall be made to conform to the requirements specified.1.1 This specification covers electric fusion-welded nickel-chromium-cobalt-molybdenum alloy UNS N06617, nickel-iron-chromium-silicon alloys UNS N08330 and UNS N08332, Ni-Cr-Fe-Al Alloy (UNS N06603), Ni-Cr-Fe Alloy UNS N06025, and Ni-Cr-Fe-Si Alloy UNS N06045 pipe intended for heat resisting applications and general corrosive service.1.2 This specification covers pipe in sizes 3 in. (76.2 mm) nominal diameter and larger and possessing a minimum wall thickness of 0.083 in. (2.11 mm).1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Material Safety Data Sheet (MSDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价: 515元 / 折扣价: 438 加购物车

在线阅读 收 藏

This guide covers UNS N08367 and UNS N08926 welded pipe for general corrosion applications. The joints of the specimens shall be double or single welded and full penetration welded made. The welds shall be made either manually or automatically by an electric process involving the deposition of filler metal according to the class specified. The weld surface on either side of the weld shall be flush with the base plate. The contour of the reinforcement shall be reasonably smooth and free of irregularities. The deposited metal shall be fused uniformly into the plate surface. Transverse tension tests shall be made across the welded joint to assure that it must have the same minimum ultimate tensile strength as the specified minimum ultimate tensile strength of the plate. Transverse guided weld bend test shall be used to check cracks or other imperfections. The pipe shall be furnished with smooth ends, free of burrs and injurious defects and shall have a workmanlike finish.1.1 This specification covers UNS N08367 and UNS N08926 welded pipe for general corrosion applications. (Although no restrictions are placed on the sizes of pipe that may be furnished under this specification, commercial practice is commonly limited to sizes not less than 8 in. nominal diameter.)1.2 Six classes of pipe are covered as follows:1.2.1 Class 1 pipe shall be double welded by processes employing filler metal in all passes and shall be completely radiographed.1.2.2 Class 2 pipe shall be double welded by processes employing filler metal in all passes. No radiography is required.1.2.3 Class 3 pipe shall be double welded by processes employing filler metal in all passes except the inside root weld may be made without the addition of filler metal. Welds are to be completely radiographed.1.2.4 Class 4 pipe shall be double welded by processes employing filler metal in all passes except the inside root weld may be made without the addition of filler metal. No radiography is required.1.2.5 Class 5 pipe shall be single welded by processes employing filler metal in all passes except that the pass exposed to the inside pipe surface may be made without the addition of filler metal. Welds are to be completely radiographed.1.2.6 Class 6 pipe shall be single welded by processes employing filler metal in all passes except that the pass exposed to the inside pipe surface may be made without the addition of filler metal. No radiography is required.1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.1.4 The following safety hazards caveat pertains only to the test methods portion, Section 13, of this standard: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价: 590元 / 折扣价: 502 加购物车

在线阅读 收 藏

This specification covers aluminum and aluminum-alloy formed and arc-welded round tube, made from formed sheet or plate, butt welded by gas-tungsten or gas-metal arc-welding methods with or without the use of filler metal. The tube shall be made by roll forming (or other suitable forming) sheet or plate into a circular contour with the longitudinal edges butted together for welding. The sheet or plate shall be roll-formed so that the edges are butted together in a helical pattern around the circumference of the tube. The edges shall be welded together by a gas-shielded-arc process. Tensile strength, yield strength, and elongation of the specimens shall be determined by tension test. Specimens may be subjected to a pressure test and a radiographic examination.1.1 This specification covers aluminum and aluminum-alloy (Note 1) formed and arc-welded round tube in diameters 9 to 60 in. [230 to 1520 mm], made from formed sheet or plate, butt welded by gas-tungsten or gas-metal arc-welding methods with or without the use of filler metal.Note 1—Throughout this specification use of the term alloy in the general sense includes aluminum as well as aluminum alloy.Note 2—The requirements for the sheet and plate used are the same as in Specifications B209 or B209M.1.2 Alloy and temper designations are in accordance with ANSI H35.1/H35.1M. The equivalent Unified Numbering System alloy designations are those of Table 1 preceded by A9, for example, A91100 for aluminum 1100 in accordance with Practice E527.1.3 For acceptance criteria for inclusion of new aluminum and aluminum alloys in this specification, see Annex A2.1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.1.4.1 The SI units are shown either in brackets or in separate tables.

定价: 0元 / 折扣价: 0

在线阅读 收 藏

This specification covers minimum-wall-thickness carbon steel tubes proposed for use in heat exchangers, condensers, and similar heat-transfer apparatus. The materials under this specification shall be in accordance with other ASTM document enlisted herein unless otherwise provided. The tubes shall be manufactured by electric-resistance welding and shall undergo heat treatment. Mechanical testing of the specimens shall include a flattening test, flange test and a reverse flattening test. The specimens shall also be subjected to Brinell or Rockwell hardness test and hydrostatic or nondestructive electric test.1.1 This specification2 covers minimum-wall-thickness, electric-resistance-welded, carbon steel tubes to be used for heat exchangers, condensers, and similar heat-transfer apparatus.1.2 The tubing sizes usually furnished to this specification are to 3 in. [76.2 mm] in outside diameter, inclusive. Tubing having other dimensions may be furnished, provided such tubes comply with all other requirements of this specification.1.3 Mechanical property requirements do not apply to tubing smaller than 1/8 in. [3.2 mm] in inside diameter or 0.015 in. [0.4 mm] in thickness.1.4 The purchaser shall specify in the order the outside diameter and minimum wall thickness. The inside diameter shall not be specified.1.5 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification. The inch-pound units shall apply unless the “M” designation of this specification is specified in the order.1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价: 515元 / 折扣价: 438 加购物车

在线阅读 收 藏

This specification covers plain and deformed steel wire and plain and deformed steel welded wire reinforcement with protective epoxy coating for use in concrete, masonry and mechanically stabilized earth applications. The materials under this specification shall be in accordance with other ASTM documents enlisted herein. Tests for coating thickness and continuity shall be made on each size of wire or style of welded wire reinforcement. Bend tests for coating flexibility shall be conducted on at least one wire of each size or style or welded wire reinforcement. If the specimen fails to meet the specified requirements for coating thickness, continuity, or bend test (if applicable), two retests on random specimens shall be conducted for each failed test. If both retests meet the specified requirements, the coated material represented by the specimens shall be accepted.1.1 This specification covers plain and deformed steel wire and plain and deformed steel welded wire reinforcement with protective epoxy coating. A Class A minimum coating thickness is required for wire and welded wire reinforcement intended for use in concrete and masonry. A Class B minimum coating thickness is required for wire and welded wire reinforcement intended for use in mechanically stabilized earth applications. A Type 1 coating is a fusion-bonded epoxy coating that has been formulated to be sufficiently flexible to allow bending of the coated wire or welded wire reinforcement. A Type 2 coating is a fusion-bonded epoxy coating that has not been designed to be sufficiently flexible to allow bending of the coated wire or welded wire reinforcement.NOTE 1: The coating applicator is identified throughout this specification as the manufacturer.1.2 This specification is applicable for orders in either inch-pound units (as Specification A884) or SI units [as Specification A884M].1.3 The values stated in either inch-pound or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other except as specifically noted in Table 1. Combining values from the two systems may result in non-conformance with this specification.1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价: 590元 / 折扣价: 502 加购物车

在线阅读 收 藏

This guide establishes requirements for seamless and welded copper-nickel tubes for use in heat exchangers in water desalting plants. Seamless tubes shall be manufactured by hot extrusion or piercing, and subsequent cold working and annealing as to produce a uniform, seamless wrought structure in the finished product. The welded tubes shall be manufactured from flat rolled strip which is subsequently formed and welded by a forge-weld process or a fusion-weld process. For forged-welded tube, the edges of the strip shall be heated to a required welding temperature, usually by high-frequency electric current, and be pressed firmly together causing a forged-type joint to be formed with internal and external flash or bead. On the other hand, fusion-welded tube shall be mechanically worked to produce a smooth external and internal surface without the application of scarfing or other removal of the weld bead. The product shall be cold worked and annealed as necessary to meet properties of the temper specified. The test specimen shall be free of defects, but blemishes of a nature that do not interfere with the intended application are acceptable for the following tests: expansion test, flattening test, and reverse-bend test. Forged-welded and annealed tubes shall have a completely recrystallized grain structure, and the weld zone shall have a structure typical of hot-forged welds. Fusion-welded and annealed tube shall have a structure typical of a fusion weld on its weld zone. The product shall be clean and free from defects, but blemishes of a nature that do not interfere with the intended application are acceptable.1.1 This specification establishes requirements for seamless and welded copper-nickel tubes from 0.250 to 2.125 in. (6.35 to 54.0 mm) in diameter for use in heat exchangers in water desalting plants. The following alloys are involved:Copper orCopper Alloy UNS No. Type of MetalC70600 90-10 copper-nickelC70620 90-10 copper-nickel(Modified for Welding)C71500 70-30 copper-nickelC71520 70-30 copper-nickel(Modified for Welding)C71640 copper-nickel-iron-manganeseC72200 copper-nickel1.2 Units—Values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.1.3 The following safety hazard caveat pertains only to the test methods of Section 16 described in this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to its use.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价: 590元 / 折扣价: 502 加购物车

在线阅读 收 藏

This specification covers electric-resistance-welded low-carbon steel pipe for use as process lines in chemical industries. The steel shall be aluminum killed steel made by one or more of the following processes: open-hearth, basic-oxygen, or electric-furnace. The steel may be cast in ingots or strand cast and the pipe shall be made by electric resistance welding. Pipe furnished in the as-welded condition shall be normalized at a temperature above the upper critical temperature. Cold-drawn pipe shall be normalized after the final cold-draw pass. The pipes shall undergo the following tests: tensile test, flattening test, reverse flattening test, flange test and nondestructive tests. The nondestructive tests shall include eddy-current test, ultrasonic test, and flux leakage test.1.1 This specification2 covers electric-resistance-welded low-carbon steel pipe intended for use as process lines.1.2 Pipe ordered under this specification shall be suitable for severe forming operations involving flanging in all sizes and bending to close radii up to and including NPS 4 [DN 100].1.3 This specification covers NPS 1/2 [DN 15] through NPS 10 [DN 250], plus additional sizes. The corresponding outside diameters and wall thicknesses for NPS 1/2 [DN 15] through 10 [DN 250] are listed in Table 1, as are the dimensions for the additional sizes.NOTE 1: The dimensionless designator NPS [DN] (nominal pipe size) has been substituted in this standard for such traditional terms as “nominal diameter,” “size,” and “nominal size.”1.4 Units—This specification is expressed in both inch-pound units and in SI units; however, unless the purchase order or contract specifies the applicable M specification designation (SI units), the inch-pound units shall apply. The values stated in either inchpound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.1.5 The following precautionary caveat pertains only to the test method portion, Sections 7, 13, and 14, of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价: 590元 / 折扣价: 502 加购物车

在线阅读 收 藏

This specification covers four specific types of plain end or threaded and coupled carbon steel pipe for use in water wells. Water well pipe are classified into four types according to grads: type I, drive pipe; type II, water-well reamed and drifted pipe; type III, driven well pipe; and type IV, water-well casing pipe. The steel for both seamless and welded pipe shall be made by one of the following processes: open-hearth, electric furnace, or basic-oxygen. Tensile test, tension test, and hydrostatic test shall be required to conform to the requirements specified.1.1 This specification covers four specific types of plain end or threaded and coupled carbon steel pipe for use in water wells.1.2 Each type of water well pipe shall conform to the following methods of manufacture and grade as specified on the purchase order:1.2.1 Type I, Drive Pipe—Seamless or electric-resistance-welded, Grades A and B.1.2.2 Type II, Water-Well Reamed and Drifted Pipe—Seamless or electric-resistance-welded, Grades A and B, or furnace-butt welded.1.2.3 Type III, Driven Well Pipe—Seamless or electric-resistance-welded, Grades A and B, or furnace-butt welded.1.2.4 Type IV, Water-Well Casing Pipe—Seamless or electric-resistance-welded, Grades A and B, or furnace-butt welded.1.3 The values stated in either inch-pound units or in SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values in each system are not exact equivalents; therefore, each system is to be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.NOTE 1: The dimensionless designator NPS (nominal pipe size) and DN (Nominal Diameter) have been substituted in this standard for such traditional terms as “nominal diameter,” “size,” and “nominal size.”1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价: 646元 / 折扣价: 550 加购物车

在线阅读 收 藏
177 条记录,每页 15 条,当前第 12 / 12 页 第一页 | 上一页 | 下一页 | 最末页  |     转到第   页