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GB/T 4921-1985 standard english preview version PDF file download

GB Standard Code GB/T 4921-1985
Standard Category China National Standards
GB Standard English Title Waste gasfrom manufacturing process--Determination of chemical oxygendemand and nitrogenoxide--Potassium dichromate oxidation and naphthylethylene diamine colorimetric method
GB Standard Chinese Title 工业废气 耗氧值和氧化氮的测定 重铬酸钾氧化、萘乙二胺比色法
Chinese Version Price $15 USD per 50 pages
English Translation Price About $15  per 1 page; Inquire us for detail price

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