单选题Before starting an engine by air, the engine must（）Abe turned by a turning gear for at least one minuteBbe turned by a turning gear for at least two minutesCbe turned at least one complete turnDbe turned at least two complete turns
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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