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?????? ??

?? 2??? ?????? ??? ??? ??? ??.

?? ???? ?????? ??? ??? ??? ??? ????: ??? ??.

German Institute for Standardization, ?????? ??

• DIN 55912-2:1999 ?????? ?? ????

Professional Standard - Electron, ?????? ??

• SJ/T 10898-1996 ???? ? ??? ? ??????? ???? ??

??:   ??????, ?? ??????, ??????, ?????? ???, ?????? ??, ?????? ??, ?????? ??, ?? ??????, ?????? ????, ????? ?, ?????? ???, ?????? ??, ?????? ??, ?????? ??, ?????? ??, ??????? ??, ????? ??, ?????? ???, ?????? ??, ??????+.