Bottom blow valves are installed on auxiliary water-tube boilers to （）<br>A:completely drain the boiler in an emergency<br>B:prevent sludge from forming in the drum<br>C:remove floating impurities from the boiler water surface<br>D:remove settled solids from the water drum

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

出自：海船船员证

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