单项选择题
A.correct maneuvering B.wear C.working efficiency D.maintenance
The way to reduce （） is to build up a film of lubricant...
单项选择题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
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
The viscosity regulator controls the （） of the fuel oil...
单项选择题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
