单选题The soot blowers are operating in the oil fuel boiler the air/fuel ratio must （） throughout the action, and blowers greased after use.Abe increasedBbe decreasedCremain constantDeither be increased or remain constant
单选题
The soot blowers are operating in the oil fuel boiler the air/fuel ratio must （） throughout the action, and blowers greased after use.
A
be increased
B
be decreased
C
remain constant
D
either be increased or remain constant
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