单项选择题
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（）.
A.PP-system
B.PA-system
C.AP-system
D.AA-system
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相关考题
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单项选择题
The speed at which a storm centre moves is the（）.
A.speed of movement
B.speed of advance
C.speed of storm
D.storm movement speed -
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（）.
A.ground speed
B.boarding speed
C.relative speed
D.speed of the vessel -
单项选择题
The step of a pilot ladder which prevents the ladder from twisting is the（）.
A.proof bar
B.shifting bar
C.long bar
D.spreader
