多项选择题
A.自由沉淀 B.絮凝沉淀 C.拥挤沉淀 D.压缩沉淀
A.1mg/L B.2mg/L C.3mg/L D.4mgL
A.85~95% B.75~85% C.65~75% D.50~65%以下
A.95~97% B.90~95% C.85~90% D.80~85%
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