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DE?? ? ??? ??
?? 4??? ?? ? ??? ??? ??? ??? ??.
?? ???? ?? ? ??? ??? ??? ??? ??? ????: .
Professional Standard - Aviation, ?? ? ??? ??
Military Standard of the People's Republic of China-General Armament Department, ?? ? ??? ??
未注明發(fā)布機(jī)構(gòu), ?? ? ??? ??
Professional Standard - Railway, ?? ? ??? ??