Public address system: loudspeakers in the vessel’s cabins, mess rooms, ETC., and on deck via which important information can bebroadcast from a central point, mostly from the navigation bridge defines（）.

The speed at which a storm centre moves is the（）.A.spee...

单项选择题The speed at which a storm centre moves is the（）.

The speed of a vessel adjusted to that of a pilot boat ...

单项选择题The speed of a vessel adjusted to that of a pilot boat at which the pilot can safely embark is（）.

The step of a pilot ladder which prevents the ladder fr...

单项选择题The step of a pilot ladder which prevents the ladder from twisting is the（）.