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1.As viewed from application of the technoogy of producing high-pure manganes carbonate using poor manganese, ferrisulphas and ammonium hydrogen carbonate as raw material is introduced.

1.本文从应用的角度出发,以贫锰矿、亚铁、碳等为原料,生产高纯碳锰的方法。

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do justice, do oneself proud, do or die, do over, do sb a favour, do some cooking, do some shopping, do somebody a favor, do someone a favor, do sport,

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3G, 401(K), a,

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