单项选择题

（） is not properly set thus causing either advanced or retarded firing.

A.A piston
B.A fuel injection pump
C.A feed water pump
D.A lube oil pump

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单项选择题

（） the supercharge pressure is, （） power an engine develops.

A.The higher；the more
B.Higher；more
C.Higher；little
D.The higher；the less

单项选择题

（） the cylinder will contain a great weight of air and will be capable of burning a great quantity of fuel.

A.At the beginning of the compression stroke
B.At the beginning of the suction stroke
C.At the end of the working stroke
D.At the end of the exhaust stroke