单项选择题
A.spraying directly on the base of the fire B.flowing the foam down a vertical surface C.sweeping the fire before you with the foam D.spraying directly on the surface of the fire
During the inspection, the starting air valves should b...
单项选择题During the inspection, the starting air valves should be closed （）the engine from turning.
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
