When there is a flame failure in an automatically fired auxiliary boiler, the （）.<br>A:air supply is shut off<br>B:fuel supply is shut off<br>C:water supply is shut off<br>D:safety valve lifts

When there is a flame failure in an automatically fired auxiliary boiler, the （）.
A:air supply is shut off
B:fuel supply is shut off
C:water supply is shut off
D:safety valve lifts

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