单项选择题
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.
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.
单项选择题 The viscosity regulator controls （） in order to provide oil at the correct viscosity for combustion.