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單項選擇題

Reducing the clearance between a valve stem and rocker arm will result in the valve （）

A.having a shorter duration of opening
B.having a longer duration of opening
C.closing sooner
D.opening later

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單項選擇題

If you increase the clearance between a valve stem and rocker arm, which of the listed condition will occur?（）

A.valve will open later
B.valves will close later
C.amount of fuel injected will be increased
D.amount of fuel injected will be decreased

單項選擇題

A drop in compression pressure in one cylinder of a diesel engine can be caused by（）

A.a leaking fuel injection nozzle
B.a clogged air filter
C.early fuel injection
D.burned valves

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