單項選擇題

The usual method of effectively applying foam on a fire is by （）.

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

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單項選擇題

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

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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