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In the event of a flame failure in an auxiliary water-tube boiler, you must（）
A:relight the boiler immediately to prevent loss of steam pressure
B:relight the fire off the brickwork as the bricks are cherry red
C:purge the furnace of any combustible gases before attempting to relight the fire
D:speed up the feed pump to prevent dry firing when the burner flame is reestablished

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出自：海船船员证

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