单项选择题

In a four-stroke/cycle diesel engine, after the completion of the power stroke, the piston will move（）

A.up and draw in a fresh air charge
B.down to burn off fuel
C.down to compress the fuel air charge
D.up and force out the exhaust gases

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单项选择题

A.late fuel injection
B.early fuel injection
C.high exhaust temperature from that cylinder
D.decreased effective stroke from that injector

单项选择题

In a diesel engine, exhaust valves open before the intake ports are uncovered to （）
Ⅰ.reduce pumping losses
Ⅱ.reduce back pressure

A.Ⅰonly
B.Ⅱonly
C.bothⅠand Ⅱ
D.neitherⅠnor Ⅱ

单项选择题

A.Intake manifold
B.Water-cooled exhaust system
C.After-cooler
D.Exhaust diffuser