单项选择题
Broken intake valve springs on one cylinder of a diesel engine can cause the engine to （）
A.Over speed B.fire improperly C.lose oil pressure D.overheatrapidly
单项选择题 A device which functions to bring a diesel engine to a full stop to protect it from damage is known as a/an （）
单项选择题 Black smoke exhausting from an operating diesel engine can be caused by （）
单项选择题 White smoke exhausting from a diesel engine can be caused by a （）
