Before starting an engine by air, the engine must（）<br>A:be turned by a turning gear for at least one minute<br>B:be turned by a turning gear for at least two minutes<br>C:be turned at least one complete turn<br>D:be turned at least two complete turns

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

出自：海船船员证

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