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Shipbuilding
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启门
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水密小舱口盖、水密门和水密窗启闭灵活性试验
opening-closing flexibility test for small watertight hatch cover, watertight door and watertight window
水密小舱口盖、门和启闭灵活性试验
opening-closing flexibility test for small watertight hatch cover, door and window
泥舱门启闭装置整修
hopper door opening-closing gear renovate
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