单项选择题
A.To add power to the engine B.To keep the engine firmly attached to its supporting base C.To keep moving engine part in their proper relative positions D.To rotate the crankshaft
An overcorrecting and unstable engine governor operatio...
单项选择题An overcorrecting and unstable engine governor operation is known as（）.
A.droop B.dead banding C.dash potting D.hunting
Coolant can be lost from a diesel engine jacket cooling...
单项选择题Coolant can be lost from a diesel engine jacket cooling waster system by leakage from（）
A.cylinder head cracks B.piping joints C.pump leaking D.all of the above
Ring groove inserts are occasionally used on aluminum a...
单项选择题Ring groove inserts are occasionally used on aluminum alloy piston to（）
A.reduce the ring groove wear rate B.seal against crankcase vapors C.lessen the wear on aluminum part of the cylinder D.allow for the greater expansion rate of aluminum
