Taking industry benzene as extraction agent, rogor is recovered from rogor synthesis waste water by multipolar counterflow extraction.
用工业苯做萃取剂，采用多塔对流萃取的方法回收废水中的乐果。
A hydraulic computation equation for water distribution sytem of counterflow type natural draft cooling tower has been established by applying Bernoulli Equation.
运用伯努利方程建立了逆流式自然通风冷却塔（逆流塔）配水的水力计算方程。
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