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GB 37479-2019
Minimum allowable values of energy efficiency and energy efficiency grades for ducted air conditioners
GB/T 223.37-2020
Iron, steel and alloy—Determination of nitrogen content—Indophenol blue spectrophotometric method after distillation separation
GB/T 17360-2020
Microbeam analysis—Method of quantitative determination for low contents of silicon and manganese in steels using electron probe microanalyzer
GB 37483-2019
Minimum allowable values of energy efficiency and energy efficiency grades for rotary aerator in wastewater treatment
GB 30255-2019
Minimum allowable values of energy efficiency and energy efficiency grades of LED products for indoor lighting
GB 37485-2019
Minimum allowable values of energy efficiency and energy efficiency grades for submersible mixers of wastewater
GB/T 20975.35-2020
铝及铝合金化学分析方法 第35部分:钨含量的测定 硫氰酸盐分光光度法
Methods for chemical analysis of aluminium and aluminium alloys—Part 35:Determination of tungsten content—Thiocyanate spectrophotometric method