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DE?? ??
?? 5??? ?? ??? ??? ??? ??.
?? ???? ?? ??? ??? ??? ??? ????: ???, ??, ?? ? ??, ??? ? ?? ??.
American Society for Testing and Materials (ASTM), ?? ??
Hebei Provincial Standard of the People's Republic of China, ?? ??
Group Standards of the People's Republic of China, ?? ??
RO-ASRO, ?? ??