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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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