For watertight bulkheads, how do you check the watertightness?

就水密舱壁而言, 怎样检查其水密性?

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Small craft - Windows, portlights, hatches, deadlights and doors - Strength and watertightness requirements.

小船.窗口, 舷窗, 舱口, 舷窗盖和门的强度和不透水性要求.

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Function that defend the tide watertightness, drive super a technical application, but get biggest and perfect.

防潮防水的性能, 被超声波技术的运用, 而得到最大的完善.

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