单项选择题
The withdrawing of the cylinder liners, in general, depends on their （）.This may amount to approximately 1/120 of the diameter in some engines.
A.correct maneuvering
B.wear
C.working efficiency
D.maintenance
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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 -
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 -
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
