![]() Iron ores—Determination of zinc content—1-(2-pyridylazo)-2-naphthol spectrophotometric method 铁矿石 锌含量的测定 1-(2-吡啶偶氮)-2-萘酚分光光度法 |
![]() Social insurance relation transfer—Part1:Enterprise emlpoyees basic old-age insurance 社会保险关系转移接续 第1部分:企业职工基本养老保险 |
![]() Social insurance relation transfer—Part 2:Basic medical insurance for employees 社会保险关系转移接续 第2部分:职工基本医疗保险 |
![]() Electroacoustics—Simulators of human head and ear—Part 5:2 cm3 coupler for the measurement of hearing aids and earphones coupled to the ear by means of ear inserts 电声学 人头模拟器和耳模拟器 第5部分:测量助听器和以插入方式与人耳耦合的耳机用2cm3声耦合器 |
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