工厂里的空气经过过滤去除杂质。
气流最后通过过滤网滤去较小尘粒和油滴，从而达到净化的目的。
Air filter to smaller screen and through the dust grain and oil droplets, so as to achieve the purpose of purifying.
该算法可以滤去短路电流中的交流谐波分量，得到直流电流变化率的准确结果。
By this algorithm, the ac harmonic components of short-circuit current can be filtered, and the accurate DC current rate of change can be obtained.
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