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单选题
Before starting an engine by air, the engine must（）
A
be turned by a turning gear for at least one minute
B
be turned by a turning gear for at least two minutes
C
be turned at least one complete turn
D
be turned at least two complete turns
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考题
单选题Before starting an engine by air, the engine must（）A
be turned by a turning gear for at least one minuteB
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be turned at least two complete turns
考题
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单选题Which is false about engine trials?（）A
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