单项选择题
To avoid scavenge fires occurring the engine timing and equipment maintenance （）.
A.should be correctly carried out
B.should correctly be taken place
C.should carried with care
D.must to carry out with great care
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Combustion knock can occur in the cylinders of a diesel engine under any condition permitting （）.
A.a shortened ignition delay period
B.a lean fuel/air mixture
C.excess fuel in the combustion chamber
D.rapid vaporization of injected fuel droplets -
单项选择题
Which of the following may cause that an engine doesnt turn on starting air?（）
A.too low starting air pressure
B.main starting valve closed
C.neither A nor B
D.A and B -
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Poor combustion in a diesel engine can be caused by （）.
A.high compression pressure
B.low intake air temperature
C.low exhaust pressure
D.high scavenge air temperature
