单选题In boilers, besides maintaining the burner atomizers, air diffuser vanes, fuel temperature, forced draft fan, fuel pump and other hardware in good condition, there are some adjustments on the （）that can produce a good flame for the most efficient operation.Afuel-air ratioBcompression ratioCfuel rackDviscosity index
单选题
In boilers, besides maintaining the burner atomizers, air diffuser vanes, fuel temperature, forced draft fan, fuel pump and other hardware in good condition, there are some adjustments on the （）that can produce a good flame for the most efficient operation.
A
fuel-air ratio
B
compression ratio
C
fuel rack
D
viscosity index
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