问题描述：
[单选]
Whilst the engine is turning， check to see that no water is leaking into the crankcase， scavenge air belt， or from（）．
A．exhaust valves
B．starting valves
C．fuel valves
D．the indicator cock
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答案解析：无
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上一篇：With supercharging a larger mass of air is supplied to the cylinder by blowing it in under pressure， which is the best means to（）of the engine．
下一篇：While engine is in operation the piston moves up and down， thus causing the rotation of the（）．
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