单选题When stand-by engine instructions have been received, it’s necessary to make it sure that all valves in the various systems are（）AoperationalBopenCclosed securelyDat middle position
单选题
When stand-by engine instructions have been received, it’s necessary to make it sure that all valves in the various systems are（）
A
operational
B
open
C
closed securely
D
at middle position
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