The soot blowers are operating in the oil fuel boiler the air/fuel ratio must （） throughout the action, and blowers greased after use.<br>A:be increased<br>B:be decreased<br>C:remain constant<br>D:either be increased or remain constant

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

出自：海船船员证

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