单选题Flame failure in an automatically fired auxiliary boiler can from a/an （）Aincorrect electrode settingBincorrect nozzle positionCclogged fuel nozzleDbroken high tension lead
单选题
Flame failure in an automatically fired auxiliary boiler can from a/an （）
A
incorrect electrode setting
B
incorrect nozzle position
C
clogged fuel nozzle
D
broken high tension lead
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