单项选择题
For most diesel propulsion and generator engines, the over-speed trip device will stop the engine by （）
A.moving the governor control to stop B.shutting off the lubricating oil supply C.tripping the governor emergency stop lever D.shutting off the fuel supply
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（）
单项选择题 Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires（）
