manhole shaft meaning in Chinese

沙井颈

Steel manhole shafts for the underground tanks designed for the storage of flammable and non - flammable water polluting liquids
易燃的和不易燃的水污染液体地下存储用的钢制容器的
Collars for masonry manhole shafts for underground tanks designed for the storage of flammable and non - flammable water polluting liquids
易燃的和不易燃的水污染液体地下存储用的容器的砖砌
Directions for transporting and storing of concrete pipes , reinforced concrete pipes , prestressed concrete pipes and fittings and concrete manhole shaft rings
混凝土管钢筋混凝土管及预应力混凝土管管件和混