Which of the following operation is correct?______. A: After being treated in the bio-filter tank, the sewage is discharged overboard B: After going through the biological film, the sewage is discharged overboard C: The sewage treated in the bio-filter tank flows into the sterilization compartment D: The sewage is first collected in sterilization tank then discharged into the bio-filter tank.

比亚(Bio)

What kind of filter is used to extract a single-freq. harmonic from the harmonic components contained in square wave? A: Low-pass Filter B: High-pass Filter C: Band-pass Filter D: Band-elimination Filter

We can employ the next filters to detect edges from an image: A: Roberts filter B: Sobel filter C: mean filter D: Gaussian filter

The filter [img=142x47]18031c9cd67f894.png[/img] is a lowpass filter

下列关于Filter的描述中，正确的是 （）。 A: Filter只能过滤页面 B: Filter只能过滤Servlet C: Filter程序必须实现Filter接口 D: 一个web应用只能注册一个Filte

filter ____

在一个Filter中，处理filter业务的是（）方法

编写一个Filter，需要（ ）。 A: 实现Filter接口 B: 继承HttpFilter类 C: 实现HttpFilter接口 D: 继承Filter类

‏编写一个Filter，需要（）。‏ A: 继承Filter 类 B: 实现Filter 接口 C: 继承HttpFilter 类 D: 实现HttpFilter接口