balanced hatchcover
... 平底船 bateau(x) 平衡舱盖 balanced hatchcover 平衡舵 balanced rudder ...
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平衡舱口盖 all-balanced cover
弹簧平衡舱口盖 spring balanced hatchcover
平衡升降式舱口盖 balance lift type hatchcover
重力平衡舱口盖 gravity balanced hatch cover
重力平衡式舱口盖 gravity balanced hatchcover
弹簧平衡式舱口盖 spring balanced hatch cover
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