单选题The viscosity regulator controls the （） of the fuel oil in order to provide the oil at the correct viscosity for combustion.AtemperatureBpumping rateCpressureDheat
单选题
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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