单选题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（）.APP-systemBPA-systemCAP-systemDAA-system
单选题
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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