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

水密小舱口盖（水密门、窗）启闭灵活性、冲水检查。

youdao

Let our nerve stretch tight again for tight two months.

让我们神经再绷紧两个月。

youdao

Let our nerve stretch tight again for tight two months.

让我们神经再绷紧两个月。

youdao