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。
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。
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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