单选题Improperly fitted piston rings in a diesel engine can cause（）Aexcessive lube oil consumptionBlower than normal lube oil temperatureChigher than normal exhaust back pressureDexcessive crankshaft end play
单选题
Improperly fitted piston rings in a diesel engine can cause（）
A
excessive lube oil consumption
B
lower than normal lube oil temperature
C
higher than normal exhaust back pressure
D
excessive crankshaft end play
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