The emergency signal for fires is sounded on the ship’s whistle and general alarm as（）.<br>A:a continuous ringing for 10 seconds<br>B:one short ring followed by one long ring<br>C:two long rings of at least 20 seconds<br>D:a continuous ringing until the fire is extinguished

The emergency signal for fires is sounded on the ship’s whistle and general alarm as（）.
A:a continuous ringing for 10 seconds
B:one short ring followed by one long ring
C:two long rings of at least 20 seconds
D:a continuous ringing until the fire is extinguished

出自：海船船员证

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