单选题A viscosity regulator used for an engine is usually provided in order to （） for an engine burning heavy fuel oil.Aregulate the fuel supplyBmaintain a constant fuel viscosity at the fuel valvesCmaintain efficient coolingDalter the fuel density
单选题
A viscosity regulator used for an engine is usually provided in order to （） for an engine burning heavy fuel oil.
A
regulate the fuel supply
B
maintain a constant fuel viscosity at the fuel valves
C
maintain efficient cooling
D
alter the fuel density
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