单项选择题

A fuel injection valve opening at pressure lower than normal will result in（）.

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

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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

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Which of the engine components listed increases air charge density and helps to improve engine operating efficiency?（）

A.Intake manifold
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单项选择题

A diesel engine will lose power if fuel injection occurs too early because the （）

A.fuel will not be properly atomized in the cylinder
B.ignition will be delayed due to low ignition temperature
C.maximum fuel expansion will occur on the compression stroke
D.fuel will ignite before top dead center