单项选择题

Persistent knocking of one cylinder of a diesel engine ceases when the fuel supply to that cylinder is securedThis problem may be a result of （）

A.low loading of that cylinder
B.faulty combustion in that cylinder
C.sluggish piston ring action
D.excessive piston cooling

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单项选择题

A.low oil pressure
B.high coolant pressure
C.leaking fuel injector
D.cracked cylinder head or liner

单项选择题

A.speed limiting governor
B.variable speed governor
C.constant speed governor
D.load limiting governor

单项选择题

A.high cost of fuel
B.serious fire hazard
C.possibility of pollution
D.poor combustion which will occur in that cylinder