单项选择题
Diesel engine crankshaft deflection readings are generally taken at four crank positionsGood engineering practice requires the deflection gage or indicator to be（）
A.placed as near the crankpin axis as possible B.removed each time the crankshaft is repositioned C.left in place for all four readings D.reset to zero for all four readings
单项选择题 Fuel oil injected into the cylinder of a diesel engine just after the piston passes top dead center, will（）
单项选择题 Diesel engine injection lag is caused by（）
单项选择题 Abnormal crankpin bearing and piston skirt surface wear indicate（）
