单项选择题X 纠错
A.a glazed surface on the spring
B.nicks in the protective coating
C.a build up of sludge deposits
D.cracks in the surface of the spring
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单项选择题
A.Frequent draining of accumulated moisture
B.Frequent testing of relief valves
C.A close watch on temperature to prevent fluctuations in pressure
D.Frequent cleaning to re move oil and foreign matter
单项选择题
A.over-speeding
B.overload
C.low exhaust temperature
D.high crankcase pressure
单项选择题
A.line up the engine fore restarting with light diesel oil
B.reposition the fuel injection cam
C.change the intake and exhaust valve cam positions
D.place the starting cam in the intermediate position
单项选择题
A.High sulphur content fuel
B.High lube oil temperatures
C.High vanadium content fuel
D.Excessive piston slap
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
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
单项选择题
A.clogged air filter
B.compression stroke
C.burned exhaust valves
D.all of the above