GB/T 12993-1991

GB/T 9537-1988 Keyboard switches foruse in electronic equipment--Part 1:Generic specification GB/T 12272-1990 Measuring method of radio-frequency high potential withstanding voltage for radio-frequency coaxial connectors GB/T 12512-1990 Fibre optic attenuators--Part 1:Generic specification GB/T 12511-1990 Fibre optic switches--Part 1:Generic specification GB/T 12992-1991 Measuring methods of thermal characteristic for forced air cooling of electronic equipment GB/T 15157-1994 Connectors for frequencies below 3MHz for use with printed boards--Part l:Generic specification--Gen-eral requirements and guide for the preparation of detail specifications， with assessedquality GB/T 15176-1994 Generic specification for socketsand accessories for electronic plug-in devices GB/T 15428-1995 Cold plate design guideline for electronic equipment