SJ 20042-1992.Mothods of measurement for tropsphering scattering communication e...

行业标准2023.07.24

SJ 20041-1992.Evaluation method of residual intelligibility for analog - voice s...

行业标准2023.07.24

SJ 20046-1992.General spcification for portable non-metallic mine detectors.1主题内...

行业标准2023.07.24

SJ 20045-1992.General specification for air-condnction dynamic and electro magne...

行业标准2023.07.24

SJ 20045/1-1998.Detail specification of noise-cancelling transmitter for ODK-1.S...

行业标准2023.07.24

SJ 20053-1992.General specification of mechanical andphysical design and manufac...

行业标准2023.07.24

SJ 20052-1992.Detail specification for switch , waveguide , electromechanical op...

行业标准2023.07.24

SJ 20051-1992.Switches , waveguide ,general specification for.1范围1.1主题内容SJ 20051...

行业标准2023.07.24

SJ 20050-1992.Detail specification for model JPK-2 vacuum relays.1范围1.1主题内容SJ 20...

行业标准2023.07.24

SJ 20049-1992.Performance requirement for machinery electrization installation o...

行业标准2023.07.24