SY0452-2002石油天然气金属管道焊接工艺评定
<P><IMG alt="" src="http://bbs.xycost.info/editor/images/smilies/_onion/01.gif" border=0 smiliecode="<img src=" 01.gif? _onion smilies images editor>"> <IMG alt="" src="http://bbs.xycost.info/editor/images/smilies/_onion/06.gif" border=0 smiliecode="<img src=" _onion smilies images editor 06.gif?>"> </P>SY0452-2002石油天然气金属管道焊接工艺评定
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