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单选题
下列哪些声号可用灯光信号作补充？（）
A
至少五声短而急的声号
B
一长声
C
两长一短
D
四短声
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Only one pump should be used at any timeB
The ship speed should be reduced to 70% of the normalC
Watch keeping of the steering gear should be increasedD
Limitations of the steering gear should be logged but the bridge need not be informed
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Ⅰ～ⅢB
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I~IIIB
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