Band - pass Filter?

带通滤波器BF ？

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An example of extreme narrow band low pass filter is also given in detail.

给出了极窄带滤波器的具体实现方案。

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To pass(a liquid or gas)through a filter.

我们让茶通过滤器。

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To pass(a liquid or gas)through a filter.

我们让茶通过滤器。

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