A research on the Intermittent Aerotion System (IAS) for treating sewage was done by regressive orthogonal method at normal atmospheric temperature.

在常温下采用回归正交法对间歇曝气活性污泥系统(IAS)处理城市污水进行了研究。

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By the orthogonal regressive principle, the experiment method is designed, and the regularity that the affect elements si and Mn in the mechanical properties of cast zinc-base alloy have been studied.

采用正交组合回归设计实验方法，研究硅、锰元素对铸态锌基合金力学性能的影响规律。

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