单选题A burner responsible for producing black smoke in an automatic auxiliary boiler, would be caused by a （）Adefective solenoid valveBdirty fuel nozzleCgrounded high tension leadDfaulty ignition cable connector
单选题
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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