单项选择题

What is the function of an engine’s stationary parts?（）

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

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An overcorrecting and unstable engine governor operation is known as（）.

A.droop
B.dead banding
C.dash potting
D.hunting

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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

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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