GA/T 2000的本部分规定了犯罪嫌疑人进入建筑空间行为方式的分类与代码。
本部分适用于公安信息化建设以及信息的处理与管理。

定价： 19元 / 折扣价： 17 元 加购物车

定价： 无文本 / 折扣价： 0 元

1. Scope 1.1 This Standard covers the general requirements for hardware used in the construction of communication lines and power lines including distribution and transmission lines. 1.2 Detailed requirements for individual items of hardware as nu

定价： 910元 / 折扣价： 774 元

1.1 This test method describes a laboratory test for determining the resistance of metallic materials to metal-to-metal wear produced in a crossed cylinder apparatus. The intent of this test method is to produce data that will reproducibly rank materials in their resistance to wear and evaluate the compatibility of different metal couples. The test method is normally used to determine the wear resistance of a material when it wears against itself. However, the test can also be used to evaluate the compatibility of different materials. 1.2 When the rotating and stationary bars are of the same material, wear test results are reported as the total volume loss in cubic millimetres for the rotating and stationary cylinders. The manner of recording the results also specifies the particular test procedure used. The value is obtained by adding the volume loss of the rotating member to the volume loss of the nonrotating member. Materials of higher wear resistance will have lower volume loss. Note 1-To attain uniformity among laboratories, it is the intent of this test method to require that volume loss due to wear be reported only in the metric system as cubic millimetres (1 mm = 6.102 X 10 in. ). 1.3 When dissimilar materials are being tested, wear test results are reported as the volume loss in cubic millimetres for the rotating and stationary test bars separately. When two different metals or alloys are tested, it is also recommended that each metal or alloy be tested in both the stationary and moving positions. Then, for each metal or alloy, the combined volume of wear in both positions should be used in comparisons with self-mated wear volume. 1.4 The test method describes three recommended procedures that are appropriate for different degrees of wear resistance. Note 2-The crossed cylinder wear test inherently exhibits a time varying contact area. A plot of wear volume versus sliding distance is typically nonlinear. Therefore, results obtained using parameters other than those specified in the test method cannot be used to calculate an expected value. 1.4.1 Procedure A -This is a relatively severe test that will rank metallic materials which have high-wear resistance. Materials with wear resistance in the high-speed tool steel category are particularly suited to this test. 1.4.2 Procedure B -This is a short-term variation of Procedure A. 1.4.3 Procedure C -This is a lower speed and shorter term variation of Procedure A that is particularly useful in ranking materials of low-wear resistance. 1.5 In reporting, the values stated in SI units are preferred. 1.6 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 and health practices and determine the applicability of regulatory limitations prior to use.

定价： 0元 / 折扣价： 0 元

定价： 377元 / 折扣价： 321 元

定价： 2317元 / 折扣价： 1970 元 加购物车

定价： 585元 / 折扣价： 498 元 加购物车

定价： 937元 / 折扣价： 797 元 加购物车

定价： 2317元 / 折扣价： 1970 元 加购物车

定价： 0元 / 折扣价： 0 元 加购物车

定价： 2434元 / 折扣价： 2069 元 加购物车

1.1 This practice covers the basic principles and operating procedures for light-exposure apparatus with and without water spray employing a carbon-arc light source. 1.2 This practice does not specify the exposure conditions best suited for the material to be tested. It is limited to the method of obtaining, measuring, and controlling the conditions and procedures of the exposure. Sample preparation, test conditions, and evaluation of results are covered in ASTM test methods or specifications for specific materials. Note 1-Attention is called to the following test methods and practices for more information on use of this practice for specific materials: Practices D822, D904, D1499, D3361, D3815, E765 and Test Methods C732, C734, C741, D529, D750, D3424 and D3583. 1.3 This practice includes four procedures: 1.3.1 Method 1 -Continuous exposure to light and intermittent exposure to water spray. 1.3.2 Method 2 -Alternate exposure to light and darkness and intermittent exposure to water spray. 1.3.3 Method 3 -Continuous exposure to light without water spray. Specific exposure conditions for testing fabric are found in AATCC Test Method 16A. 1.3.4 Method 4 -Alternate exposure to light and darkness without water spray. 1.4 The values stated in SI units are to be regarded as the standard. The inch-pound unit equivalents of the SI units may be approximate. 1.5 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 and health practices and determine the applicability of regulatory limitations prior to use.

定价： 0元 / 折扣价： 0 元

1.1 This practice covers the basic principles and operating procedure for water- or light-exposure apparatus, or both, employing a xenon-arc light source. Note 1-This practice combines the practices previously referred to as G26 and G27. Practice G27, for Operating Xenon-Arc Type Apparatus for Light Exposure of Nonmetallic Materials , has been discontinued since it is now covered in this edition of G26 under Test Methods C and D. 1.2 This practice does not specify the exposure conditions best suited for the material to be tested, but is limited to the method of obtaining, measuring, and controlling the conditions and procedures of the exposure. Sample preparation, test conditions, and evaluation of results are covered in ASTM methods or specifications for specific materials. 1.3 This practice includes four test methods: 1.3.1 Test Method 1 -Continuous exposure to light and intermittent exposure to water spray. 1.3.2 Test Method 2 -Alternate exposure to light and darkness and intermittent exposure to water spray. 1.3.3 Test Method 3 -Continuous exposure to light without water spray. Exposure conditions are characteristic of those specified by AATCC Test Method 16E 1976. 1.3.4 Test Method 4 -Alternate exposure to light and darkness without water spray. Exposure conditions characteristic of those natural conditions experienced when exposing are in accordance with Practice G24. 1.4 The values stated in SI units are to be regarded as the standard. The inch-pound equivalents of the SI units may be approximate. 1.5 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 and health practices and determine the applicability of regulatory limitations prior to use.

定价： 0元 / 折扣价： 0 元

1.1 This specification establishes the requirements for naval brass rod, bar, and shapes produced from Copper Alloys UNS No. C46200, C46400, C47940, C48200, or C48500. 1.1.1 For piston-finish rod or shafting refer to the Other Requirements Section.1.1.2 For hot forging materials, refer to Specification B124/B124M. 1.2 Units -- The values stated in inch-pound units or SI units are to be regarded separately as standard. Within the text, SI units are shown in brackets. The values in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.1.3 Warning--Mercury is a definite health hazard in use and disposal (see Performance Requirements).

定价： 0元 / 折扣价： 0 元

定价： 0元 / 折扣价： 0 元 加购物车