handhole with butt welded flange
handhold with butt welded flange 对焊法兰手孔 handhole with butt welded flange 对焊法兰手孔 ; 对于焊法兰手孔 manhole with butt welded flange 对焊法兰人孔 ; 对于焊法兰人孔 ..
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短语
对于焊法兰手孔
handhole with butt welded flange
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