The signal for a fire emergency on an OSV is（）.<br>A:a 30 second on 30 second off alternating signal<br>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<br>C:an intermittent ringing of the general alarm for not less than ten seconds<br>D:announced over the PA system

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

出自：海船船员证

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