The crankcase cover should never be allowed to open for investigation when （）<br>A:the engine stops<br>B:the engine is running<br>C:you repair the engine<br>D:overhauling the engine

The crankcase cover should never be allowed to open for investigation when （）
A:the engine stops
B:the engine is running
C:you repair the engine
D:overhauling the engine

出自：海船船员证

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