单项选择题
The highest loads applied to the diesel engine crankshaft main bearings are （）
A.axial loads B.firing loads C.inertia loads D.centripetal loads
单项选择题 For most diesel propulsion and generator engines, the over-speed trip device will stop the engine by （）
单项选择题 If a diesel engine is smoking excessively under load, the cause could be （）
单项选择题 A diesel engine emits blue exhaust smoke as a result of（）
