单选题A firebox explosion in an automatically fired auxiliary boiler may be the result of （）Aexcessive purging before lighting offBinsufficient trail for ignition periodCa faulty transformer in the ignition circuitDinsufficient purging before lighting off
单选题
A firebox explosion in an automatically fired auxiliary boiler may be the result of （）
A
excessive purging before lighting off
B
insufficient trail for ignition period
C
a faulty transformer in the ignition circuit
D
insufficient purging before lighting off
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