问题描述：
[单选]
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
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答案解析：无
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上一篇：The crank-room cover should not be opened until at least（）minutes after the engine stops．
下一篇：The crankcase can not be opened（）the parts have been cooled down．
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