单项选择题

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

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单项选择题

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

单项选择题

A.on the power stroke
B.on the exhaust stroke
C.at the end of the power stroke
D.at the start of the intake stroke

单项选择题

A.early fuel injection timing
B.leaking valves
C.a continuously open scavenge air port
D.low cooling water temperature