A burner responsible for producing black smoke in an automatic auxiliary boiler, would be caused by a （）<br>A:defective solenoid valve<br>B:dirty fuel nozzle<br>C:grounded high tension lead<br>D:faulty ignition cable connector

A burner responsible for producing black smoke in an automatic auxiliary boiler, would be caused by a （）
A:defective solenoid valve
B:dirty fuel nozzle
C:grounded high tension lead
D:faulty ignition cable connector

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