GB - Chinese national standards

Norm of the energy consumption per unit production of coal-based activated carbon and semi-coke

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Eddy current testing method of copper and copper-alloys rods, bars and wires

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Benefit calculation to determine the mining and processing of low-grade ore of copper mine

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The norms for the integrated treatment of copper mine acidic waste water

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Integrated treatment specification for acidic wastewater from copper mines

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Run-outsundercuts and chamfers forgeneral purpose metric screw threads

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Rolling bearings—Four-row tapered roller bearings—Boundary dimensions

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Dense shaped refractory products—Determination of permeability to gases

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Specification for classification and labelling of chemicals—Part 1General rules

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