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.

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.

单项选择题 The viscosity regulator controls the fuel oil temperature （） provide oil at the correct viscosity for combustion.