船舶用的甲板起重机械（绞车）、船头门、舱壁阀、船尾推进器等；

The ships deck hoisting machinery such as bow gate, bulkhead valve, stern propeller and so on;

youdao

船舶用的甲板起重机械（绞车）、船头门、舱壁阀、船尾推进器等；

The ships deck hoisting machinery such as bow gate, bulkhead valve, stern propeller and so on;

youdao