The correct procedure for giving an auxiliary boiler a bottom blow, is to begin（）<br>A:when the boiler has been secured long enough for most solids to settle<br>B:when the boiler has been cooled to ambient temperature<br>C:only after raising the water level to within 0~5 inch of the high water cutout only<br>D:after bypassing the low pressure

The correct procedure for giving an auxiliary boiler a bottom blow, is to begin（）
A:when the boiler has been secured long enough for most solids to settle
B:when the boiler has been cooled to ambient temperature
C:only after raising the water level to within 0~5 inch of the high water cutout only
D:after bypassing the low pressure

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