水密小舱口盖（水密门、窗）启闭灵活性、冲水检查。

Flexibility and hosing test for small water tight hatch cover(water tight door and window).

youdao

水密小舱口盖(水密门、窗)启闭灵活性、冲水检查。

Flexibility and hosing test for small watertight hatch cover (water tight door and window).

youdao

怎样保证舱口盖水密？

How is the hatch cover kept watertight?

youdao

怎样保证舱口盖水密？

How is the hatch cover kept watertight?

youdao