单项选择题
Routine monitoring of a diesel engine should include （）.
A.checking for leaks B.checking temperatures and pressures C.listening for abnormal noises D.all of the above
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 （）.
单项选择题 A diesel engine piston ring face is in direct contact with the （）.
