定价： 345元 / 折扣价： 294 元 加购物车

定价： 481元 / 折扣价： 409 元

定价： 481元 / 折扣价： 409 元 加购物车

定价： 345元 / 折扣价： 294 元 加购物车

定价： 605元 / 折扣价： 515 元 加购物车

4.1 Safety factors must be addressed and incorporated into the work to protect the workers and the public, and construction activities may need to be altered accordingly. Engineering and construction costs are a part of the analysis.4.2 Access rights to the work should be considered in the design of the project.4.3 A construction professional, who has field experience in construction activities similar to the scope of work anticipated, should review the plans for constructability prior to starting the project.4.4 Proper insurance and surety bonding to protect the interests of all parties to the agreement or contract should be considered.4.5 Risk management assessment will identify the parties that are in the best position to control and be responsible for the different risks.1.1 This guide addresses only primary safety concerns, easements, constructability, liability of the various parties, and risk management related to constructing, installing, maintaining, or changing an optical fiber network in an existing sewer.1.2 The text of this standard 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 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 requirements prior to use. See 4.1 and 5.1 – 5.1.7 for specific safety information.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： 515元 / 折扣价： 438 元 加购物车

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This part of ISO/IEC 18028 provides an overview of different techniques of security gateways, of components and of different types of security gateway architectures. It also provides guidelines for selection and configuration of security gateways.

定价： 910元 / 折扣价： 774 元

This part of ISO/IEC 18028 provides detailed direction with respect to the security aspects of using Virtual Private Network (VPN) connections to inter-connect networks, and also to connect remote users to networks.

定价： 910元 / 折扣价： 774 元

1. Scope 1.1 This Standard provides requirements for primary and secondary protectors used in telecommunication networks and installed in nonhazardous locations in accordance with the Requirements of the Canadian Electrical Code, Part I. 1.2 This S

定价： 774元 / 折扣价： 658 元

1.1 Scope For the purpose of compatible interconnection of data processing equipment via a local area network(LAN) using the token ring access method, this part of ISO/IEC 8802 a)Provides a general description of the token ring local area network (L

定价： 2366元 / 折扣价： 2012 元

Foreword to ISO/IEC 8802-5 : 1998/Amd. 1: 1998 This International Standard is part of a family of International Standards for Local and Metropolitan Area Networks. This family of International Standards deals with the Physical and Data Link layers a

定价： 2958元 / 折扣价： 2515 元

This Technical Report (TR) provides: - a description of the ISO/IEC 8802-2 LLC addressing conventions, and - the consideration for the manner in which new LLC address uses are assigned a value.

定价： 455元 / 折扣价： 387 元

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5.1 The presence of surface finger-oxide penetration and interparticle oxide networks are two of the properties used to evaluate powder forged steel parts for proper processing. Maximum acceptable depths of penetration of surface finger-oxide penetration and acceptable concentrations of subsurface interparticle oxide networks depend on the component and its service environment.5.2 Results of tests may be used to qualify parts for shipment.1.1 This test method covers a metallographic method for determining the maximum depth of surface finger-oxide penetration and the concentration of subsurface interparticle oxide networks in critical areas of powder forged steel parts.1.2 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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.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 元 加购物车