题目内容
（请给出正确答案）
[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 long 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
答案
C、purge the furnace of any combustible gases before attempting to relight the fire
