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（）.<br>A:PP-system<br>B:PA-system<br>C:AP-system<br>D:AA-system

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

出自：海船船员证

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