单项选择题
A.in order that B.because of C.in order to D.owing to
To avoid scavenge fires occurring the engine timing and...
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
Combustion knock can occur in the cylinders of a diesel...
单项选择题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
Which of the following may cause that an engine doesnt ...
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
