单选题If a diesel engine is difficult to start and operates with the engine temperatures lower than normal, you should suspect that the （）.Acompression pressures are below normalBlube oil is diluted with fuel oilCcranking speed is too lowDexhaust system is partially restricted
单选题
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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