The viscosity regulator controls the （） of the fuel oil in order to provide the oil at the correct viscosity for combustion.<br>A:temperature<br>B:pumping rate<br>C:pressure<br>D:heat

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

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