单选题The purpose of a temperature sensing device installed in the stack of a small automatically fired auxiliary steam boiler is to secure the oil burner（）Ain the event of a flame failureBin the event of a stack fireCwhen the water level reach the crown sheetDwhen the feed pump discharge pressure drops to a preset minimum
单选题
The purpose of a temperature sensing device installed in the stack of a small automatically fired auxiliary steam boiler is to secure the oil burner（）
A
in the event of a flame failure
B
in the event of a stack fire
C
when the water level reach the crown sheet
D
when the feed pump discharge pressure drops to a preset minimum
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