单项选择题

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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单项选择题

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

单项选择题

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

单项选择题

A.the exhaust valve
B.the starting air
C.the inlet valve
D.the fuel oil