单选题A smoking burner with a pulsating flame in auxiliary boiler, is an indication that the（）Afuel oil supply temperature is normalBburner electrode is incorrectly positionedCfuel／air ratio is incorrectDignition current is too low
单选题
A smoking burner with a pulsating flame in auxiliary boiler, is an indication that the（）
A
fuel oil supply temperature is normal
B
burner electrode is incorrectly positioned
C
fuel／air ratio is incorrect
D
ignition current is too low
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