The signal for a fire emergency on an OSV is().

A . a 30 second on 30 second off alternating signal B . the continuous blast of the ships whistle for not less than 10 seconds supplemented by the continuous ringing of the general alarm bells for not less than 10 seconds C . an intermittent ringing of the general alarm for not less than ten seconds D . announced over the PA system

时间:2022-09-16 05:10:30 所属题库:紧急通信题库

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