单选题When the order （） is received from the bridge, the main air stop valve in the starting air line should be shut.Astand-by engineBfull aheadCfinished with engineDfull away
单选题
When the order （） is received from the bridge, the main air stop valve in the starting air line should be shut.
A
stand-by engine
B
full ahead
C
finished with engine
D
full away
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