For example, in the previous sections, you created a filter with two clauses to see current products that have no additional units on order.
例如，在上一节中创建了包含两个子句的筛选，以查看没有额外已订购数量的当前产品。
In order to further decrease the size of the filter, a two-layer microstrip bandpass filter is also designed.
为了进一步减小滤波器尺寸，本文还设计了一个双层结构的微带带通滤波器。
Next, a low-pass first order filter is applied to stabilize the two types of fixed points.
然后应用一阶低通滤波器法分别研究了这两类不动点的控制问题。
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