During （）, the starting air valves should be closed to prevent the engine from turning.<br>A:overhaul<br>B:running<br>C:blowing down<br>D:All of the above are correct

During （）, the starting air valves should be closed to prevent the engine from turning.
A:overhaul
B:running
C:blowing down
D:All of the above are correct

出自：海船船员证

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