... screwed stay 螺旋撑条 screwed union 螺纹管接头 screwed valve 螺旋阀 ...
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... screwed plug 螺纹栓 screwed union 螺旋接头 screwed flange 螺旋凸缘,螺纹法兰...
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SCREWED TYPE UNION 螺旋式联盟 ; 螺纹类型联盟
screwed socket for union 螺旋承窝
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