单项选择题
A.low compression temperature
B.low ambient air pressure
C.high lube oil pump pressure
D.high fuel oil booster pump pressure
单项选择题 Icreasing the exhaust valve tappet clearance of a diesel engine will result in the exhaust valve opening （）
单项选择题 When the opening pressure of a diesel fuel injector is greater than that specified by the engine manufacturer，the （）
单项选择题 Broken intake valve springs on one cylinder of a diesel engine can cause the engine to （）