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單項(xiàng)選擇題

Persistent knocking in one cylinder of a diesel engine could be caused by（）.

A.a low load on that cylinder
B.sluggish piston ring action
C.excessive piston crown cooling
D.excessive clearance of piston pin

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單項(xiàng)選擇題

Operating conditions in the crank chamber are very （） those in the cylinder.

A.the same as
B.similar to
C.separated from
D.different from

單項(xiàng)選擇題

Opening of the cylinder （） will admit compressed air into the cylinder.

A.safety valve
B.indicator cock
C.blow-down valve
D.start valve

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