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The authors discuss the applications of rosin and its derivant,including nonsulfide flotation and flotation separation of nonferrous metallic ions and organic compound from aqueous solution.

讨论了松香及其衍生在非硫化选分、有色子的选分以及从水溶液中选分有机等方面的应用情况。

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on a farm, on a large scale, on a regular basis, on a small scale, on account of, on account to, on all fours, on an equal base with, on an even keel, on and off,

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3G, 401(K), a,

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