raised manhole cover 中文意思是什麼
raised manhole cover
解釋
升高人孔蓋-
Specification for manhole cover assembly, raised, oiltight, and watertight
可提升的防油防水的人孔蓋組件規范 -
Standard specification for manhole cover assembly, bolted, raised, oiltight and watertight
防油防水隆起的螺栓連接檢查孔蓋組件標準規范
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