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Methods for chemical analysis of hardmetals—Part 2:Determination of insoluble(free) carbon content—Gravimetric method and gas volumetric method
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Hardmetals—Part 3Determination of cobalt—Potentiometric method
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Hardmetals—Part 4Determination of titanium content—Photometric peroxide method
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Methods for chemical analysis of hardmetals—Part 5:Determination of tantalum and niobium content—Inductively coupled plasma emission spectrometry
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Standard for soil and water conservation monitoring and evaluation of production and construction projects
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Technical code for field joint coatings of pipeline
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Code for engineering design of synchronous digital hierarchy(SDH)optical fiber transmission system
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Technical code for internet of things application support platform engineering
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Code for engineering technology of tunnel coverageof public mobile telecommunications
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Unified standard for energy efficiency designof industrial buildings
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