If a diesel engine is difficult to start and operates with the engine temperatures lower than normal, you should suspect that the （）.<br>A:compression pressures are below normal<br>B:lube oil is diluted with fuel oil<br>C:cranking speed is too low<br>D:exhaust system is partially restricted

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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