The growth rate of microalgae followed a progressive rise with the increase of renewal rate and fall with the extension of renewal period in the culture.

半连续培养间的生长速率随更新率的上升而增大，随更新周期的延长而减小。

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The academia put forward the adjustment of "nine grades excess progressive rates" in recent year, namely: "increase tax exemption, reduce tax bracket, reduce tax rate".

近几年学术界针对工资薪金的“九级超额累进税率”提出了“提高免征额、减少级次、降低税率”的调整意见，笔者认为其中有欠妥当。

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