单项选择题
You hear the general alarm and ship’s whistle sound for over 10 seconds. Traditionally，this is the signal for（）.
A.abandon ship
B.dismissal from fire and emergency stations
C.fire and emergency
D.man overboard
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单项选择题
Is extra power available（）emergency while maneuvering?
A.for
B.in
C.during
D.to
