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單項(xiàng)選擇題

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

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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

單項(xiàng)選擇題

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