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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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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