GB - Chinese national standards

Niobium and niobium alloys rods and bars

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Designations of semiconductor materials

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Tianium sheet for plate heat exchangers

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Titanium sheet for plate heat exchangers

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Tolerances on dimensions and form of aluminium and aluminium alloy extruded profiles

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Test method for thickness of lightly doped silicon epitaxial layers on heavily doped silicon substrates—Infrared reflectance method

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Standard for groundwater quality

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Methods for chemical analysis of silicon metal—Part 1Determination of iron content

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Methods for chemical analysis of silicon metal—Part 10Determination of mercury content—Atomic fluorescence spectrometry method

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Methods for chemical analysis of silicon metal—Part 11Determination of chromium content—1,5-Diphenylcarbohydrazide spectrophotometric method

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