... watertight concrete 不透水混凝土 watertight shutter 挡水板 watertight 水密；防水 ...
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Applicable to the ventilation of the vessel cabins. Closing the shutter can achieve the effect of watertight class water proofing.
无门水密百叶窗适用于船舱通风，关闭百叶窗能达到水密防水效果。
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