求助EN287-1-2011中文版标准??? 谁有发我信箱,谢谢!... 继续阅读>
GB设计,按GB/T25198-2010时,内径≤2000mm时,直边段长度为25mm,内径>2000mm时,为40mm;同样可以加长直边段长度,按HG/T20583-1998中可增加直边段长度但不要超过封头标准中相应直边段长度的1.5倍,但更新后的HG/T20583-201... 继续阅读>
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