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

在进入封闭空间前，(如压载水舱)应作什么准备工作？

youdao

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

在进入封闭空间前，(如压载水舱)应作什么准备工作？

youdao