Bottom blow valves are installed on auxiliary water-tube boilers to ___________.A.complete

Bottom blow valves are installed on auxiliary water-tube boilers to ___________.

A.completely drain the boiler in an emergency

B.prevent sludge from forming in the drum

C.remove floating impurities from the boiler water surface

D.remove settled solids from the water drum

请帮忙给出正确答案和分析，谢谢！

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