单选题Which one is not the normal operation for boiler shutdown?（）ACarry out soot blowing if permissibleBChange fuel supply to diesel oilCClose steam stop valves on boiler when pressure is reducedDDrain boiler empty when it has cooled down
单选题
Which one is not the normal operation for boiler shutdown?（）
A
Carry out soot blowing if permissible
B
Change fuel supply to diesel oil
C
Close steam stop valves on boiler when pressure is reduced
D
Drain boiler empty when it has cooled down
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