GB - Chinese national standards

Building intercom systemsPart 1: General technical requirements

Available languages: English, Chinese

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Building intercom systems—Part 2: Technical requirements for digital building intercom systems

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Building intercom systems—Part 3: Technical requirements for specific applications

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Building intercom systems—Part 4: Application guidelines

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General science and technology infrastructurePrinciples and methods for conformance testing

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General science and technology infrastructureUnique identity authentication

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General science and technology infrastructureCore metadata of service

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General science and technology infrastructureData elements design and management

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General science and technology infrastructureGeneral terminology

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Professional standards for Pre-modern Chinese books and special collectionsPart 1Pre-1912 Chinese books

Available languages: English, Chinese

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