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?堕??????:GB3733.1~3765-83

??О????:25MPa--40MPa

???ㄦ俯搴???50??

???ㄤ?璐?娌广??姘淬??姘?绛????????ф?????????т?璐

?堕??????:304 316 20#

??绠?桅4~桅42??????绾х簿搴︽??缂??㈢?

?ョ??虹汗:ZG,G,NPT绛?

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