单项选择题

Insufficient end clearance on newly fitted piston rings in a diesel enginewill cause the rings to（）

A.jam in the most worn part of the cylinder when the rings expand
B.break in the most worn part of the cylinder when the rings expand
C.wear eccentrically on the side opposite the end gap
D.overheat and jam at the top center on the combustion stroke

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单项选择题

Before being shut down, a diesel engine should idle a few minutes in orderto （）

A.prevent governor surging at shutdown
B.make sure the fuel nozzles are flushed clean
C.prevent pressure buildup in the fuel lines
D.prevent damage from localized overheating

单项选择题

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A.stop the combustion air supply
B.engage the jacking gear
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单项选择题

Cylinder linings constructed as an integral part of the block, are characterized by which of the following disadvantages?（）

A.They conduct heat poorly
B.They are expensive
C.They cannot be replaced
D.They require special tools for removal