ductile iron pipes and fittings - screwed socket joints - assembly, sockets, screw rings, sealing rings and slip rings
韧性铸铁管道和配件.螺纹套管接头.组件,套管,螺丝环,密封环和滑动环
specification for steel pipe fittings, screwed and socket-welding for the petroleum industry
石油工业用钢管配件、螺旋管接头和套管焊接规范
I screwed the bulb into the socket.
我把灯泡拧进灯座.
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