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单选题
The backup system on an electric start survival craft is a（）.
A
hydraulic system
B
pneumatic system
C
spare battery
D
hand crank
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考题
单选题If the engine of a survival craft does not start，check to see（）.A
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all davits used for launching liferafts are operatedC
each emergency position indicating radio beacon is tested for thirty minutesD
the helicopter pad landing lights are operating in a quick-flashing mode
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