manhole shaft 中文意思是什麼

manhole shaft 解釋
沙井頸
  • manhole : 人孔,(陰溝的)檢修孔;【鐵路】避孔。
  • shaft : n 1 箭;箭桿。2 (槍、槌、斧等的)柄;矛。3 【植物;植物學】稈;莖;柄。4 【動物;動物學】羽軸;...
  1. Directions for transporting and storing of concrete pipes, reinforced concrete pipes, prestressed concrete pipes and fittings and concrete manhole shaft rings

    混凝土管鋼筋混凝土管及預應力混凝土管管件和混
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