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（）<br>A:in the event of a flame failure<br>B:in the event of a stack fire<br>C:when the water level reach the crown sheet<br>D:when the feed pump discharge pressure drops to a preset minimum

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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