单项选择题

Which of the following devices is common to both mechanical and hydraulic governors?（）

A.Direct linkage between the ball-head and fuel rack
B.A servomotor
C.A compensating device
D.Flyweights

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Which term describes piston pins having bearing surfaces in both the piston bosses and connecting rod eye?（）

A.Stationary
B.Full floating
C.Semi-floating
D.Free rolling

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The longer the ignition delay period occurs in a diesel engine, the （）.

A.less fuel will enter the cylinder
B.lower will be cylinder compression temperatures
C.more complete will be fuel combustion
D.more rapid will be the rise in combustion pressure

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Poor combustion in a diesel engine can be caused by （）.

A.high compression pressure
B.low intake air temperature
C.low exhaust pressure
D.high scavenge air pressure