hinged manhole cover 中文意思是什麼
hinged manhole cover
解釋
鉸鏈式人孔蓋-
Specification for manhole cover assembly, bolted, hinged, semi - flush, oiltight and watertight
半埋入式防油防水螺栓連接的人孔蓋組件規范 -
Standard specification for manhole cover assembly, bolted, semi - flush, oiltight and watertight, hinged
防油防水半嵌入螺栓鉸接檢查孔蓋組件
分享友人