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單項(xiàng)選擇題

The way to reduce （） is to build up a film of lubricant between any two surfaces that rub against each other.

A.friction
B.collision
C.inertia
D.resistance

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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

單項(xiàng)選擇題

The viscosity regulator controls the （） of the fuel oil in order to provide the oil at the correct viscosity for combustion.

A.temperature
B.pumping rate
C.pressure
D.heat