单项选择题
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
单项选择题 Routine monitoring of a diesel engine should include （）.
单项选择题 A diesel engine is operating with excessively high exhaust temperatures at all cylindersTo correct this condition, you should FIRST （）.
单项选择题 The function of diesel engine piston compression rings is to （）.
