在进入封闭空间前，(如压载水舱)应作什么准备工作？

Before entering an enclosed space such as ballast tank, what action will you take?

youdao

可是就在不到一年前，Roy的父亲被车压死了。

But just under a year ago, Roy's father was knocked over by a car.

youdao

可是就在不到一年前，Roy的父亲被车压死了。

But just under a year ago, Roy's father was knocked over by a car.

youdao