单选题How should signal flares be used after you have abandoned ship and are adrift in a liferaft?（）.AImmediately use all the signals at onceBUse all the signals during the first nightCEmploy a signal every hour after abandoning ship until they are goneDUse them only when you are aware of a ship or plane in the area
单选题
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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