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
时间：2022-09-24 11:07:45
所属题库：燃烧与爆炸题库
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