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贵金属及其合金材料电阻 系数测试方法
Method of measurement of resistivity of precious metals and their alloys
Method of measurement of resistivity of precious metals and their alloys
General rule of chemical analysis for hydrogen,noxygen, nitrogen,carbon and sulfur in metallic materials
Hot-rolled long products technical requirements for carbon structure steel and low-alloy structure steel
Carbide products for coal mining tools
Bead wire
Oxygen-free copper sheets and strips for vacuum electron devices
Molybdenum dises
Test methods of rare earth three-band phosphors for fluorescent lamps-Part 6:Determination of specific surface area
Test methods of rare earth three-band phosphors for fluorescent lamps-Part 5:Determination of density
Test methods of rare earth three-band phosphors for fluorescent lamps-Part 3:Determination of thermostability