单项选择题

Which of the listed conditions can cause lacquer to be deposited on a piston skirt?（）

A.High sulphur content fuel
B.High lube oil temperatures
C.High vanadium content fuel
D.Excessive piston slap

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单项选择题

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

单项选择题

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

单项选择题

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