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[主观题]
() enables the blowing down or removal of scum and impurities from the watersurface.
() enables the blowing down or removal of scum and impurities from the watersurface.
A. A blow-down valve
B. A soot blower
C. A feed check valve
D. A scum valve
提问人:网友曾深鑫
发布时间:2022-01-07