A viscosity regulator used for an engine is usually provided in order to （） for an engine burning heavy fuel oil.<br>A:regulate the fuel supply<br>B:maintain a constant fuel viscosity at the fuel valves<br>C:maintain efficient cooling<br>D:alter the fuel density

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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