A distorted furnace in a fire-tube auxiliary boiler may be the result of （）<br>A:firing for extended periods in the low fire mode<br>B:overheating, due to waterside deposits<br>C:varying the water level above the crown sheet<br>D:carrying excessive alkalinity in the boiler water

A distorted furnace in a fire-tube auxiliary boiler may be the result of （）
A:firing for extended periods in the low fire mode
B:overheating, due to waterside deposits
C:varying the water level above the crown sheet
D:carrying excessive alkalinity in the boiler water

出自：海船船员证

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