问题描述：
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If a diesel engine is difficult to start and operates with the engine temperatures lower than normal， you should suspect that the（）．
A．compression pressures are below normal
B．lube oil is diluted with fuel oil
C．cranking speed is too low
D．exhaust system is partially restricted
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答案解析：无
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下一篇：Routine monitoring of a diesel engine should include（）．
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