（）is the main center-line structural member，running fore and aft along the bottom of a ship，sometimes referred to as the backbone.

电缆与船壳板、防火隔堵及甲板的敷设间距不小于（）A.5mmB.20mmC.60mmD.100mm

单项选择题电缆与船壳板、防火隔堵及甲板的敷设间距不小于（）

泰国人认为人体的（）是不洁的。A.左手和脚B.右手和脚C.头部D.手指

单项选择题泰国人认为人体的（）是不洁的。

A ship can request completion of a （） when the ship is ...

单项选择题A ship can request completion of a （） when the ship is at a higher security level than the port facility or another ship it is interfacing with.