GB - Chinese national standards

Information technology—Learning,education and training—Learning object metadata

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Information technology - Learning, education and training - Participant identifiers

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Specification for equipping and managing of the measuring instrument of energy in chemical enterprise

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Specification for equipping and managing of measuring instrument of energy in the iron and steel industry

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Specification for equipping and managing of measuring instrument of energy in fossil power plants

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The norm of energy consumption per unit carbon product materials

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By-product gypsum used in cement

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By-product gypsum used in cement

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Portland cement clinker

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Intellectual property documentation and information—Classification and codes

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