How should signal flares be used after you have abandoned ship and are adrift in a liferaft?（）.<br>A:Immediately use all the signals at once<br>B:Use all the signals during the first night<br>C:Employ a signal every hour after abandoning ship until they are gone<br>D:Use them only when you are aware of a ship or plane in the area

How should signal flares be used after you have abandoned ship and are adrift in a liferaft?（）.
A:Immediately use all the signals at once
B:Use all the signals during the first night
C:Employ a signal every hour after abandoning ship until they are gone
D:Use them only when you are aware of a ship or plane in the area

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