单项选择题
A.to increase B.to speed up C.to prevent D.to reduce
The viscosity regulator controls the fuel oil temperatu...
单项选择题The viscosity regulator controls the fuel oil temperature （）provide oil at the correct viscosity for combustion.
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
