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DE?? ?? ??,
?? 6??? ?? ?? ??,? ??? ??? ??.
?? ???? ?? ?? ??,? ??? ??? ??? ????: ??, ???, ?????? ??, ?? ??.
American Society of Mechanical Engineers (ASME), ?? ?? ??,
British Standards Institution (BSI), ?? ?? ??,
Group Standards of the People's Republic of China, ?? ?? ??,
PL-PKN, ?? ?? ??,