正文：降低细泥锡精矿二氧化硅含量的试验研究 关键词】细泥锡精矿；二氧化硅；正浮选；反浮选 [gap=717]Key words: fine mud tin concentrate; silica; positive flotation; reverse flotation
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reverse-positive flotation 反浮正浮
Positive flotation-reverse flotation 正浮选
Reverse flotation-positive flotation 反浮选
positive-negative flotation process 正
However stock market traders remain positive about Facebook's flotation.
BBC: Facebook unveils $5bn stock market flotation plans
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