单项选择题
A diesel engine could fail to start because of （）
A.incorrect injection timing B.low exhaust back pressure C.floating exhaust valves D.excessive cranking speed
单项选择题 Excessive vibration in an operating diesel generator may be caused by （）
单项选择题 If you observe smoke coming from the turbocharger of an auxiliary diesel engine, you should（）
单项选择题 Clogged or partially obstructed exhaust ports on a diesel engine can cause（）
