单选题

In the event of a flame failure in an auxiliary water-tube boiler, you must _____

A purge the furnace of any combustible gases before attempting to relight the fire

B speed up the feed pump to prevent dry firing when the burner flame is reestablished

C relight the fire off the brickwork as long as the bricks are cherry red

D relight the boiler immediately to prevent loss of steam pressure

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正确答案：A （备注：此答案有误）

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