Bottom blow valves are installed on auxiliary water-tube boilers to （）<br>A:remove suspended and precipitated solids from the boiler water<br>B:completely drain the boiler in an emergency situation<br>C:prevent hardened scale deposits in the water drum<br>D:remove floating impurities from the oily water surface

Bottom blow valves are installed on auxiliary water-tube boilers to （）
A:remove suspended and precipitated solids from the boiler water
B:completely drain the boiler in an emergency situation
C:prevent hardened scale deposits in the water drum
D:remove floating impurities from the oily water surface

出自：海船船员证

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