单选题In the event of a flame failure in an auxiliary water-tube boiler, you must（）Arelight the boiler immediately to prevent loss of steam pressureBrelight the fire off the brickwork as the bricks are cherry redCpurge the furnace of any combustible gases before attempting to relight the fireDspeed up the feed pump to prevent dry firing when the burner flame is reestablished
单选题
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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名词解释题失效时间failure event