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.<br>A:fuel-air ratio<br>B:compression ratio<br>C:fuel rack<br>D:viscosity index

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

出自：海船船员证

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