这张图片是由宽带滤波器和窄带滤波器所拍摄的照片所合成的。
The picture is a composite of images taken through both broad and narrow band filters.
开发了电力滤波器实用化设计软件包，为滤波器设计提供了有力的工具。
A new package is developed to provide an useful tool for A. C. filter design.
开发了电力滤波器实用化设计软件包，为滤波器设计提供了有力的工具。
A new package is developed to provide an useful tool for A. C. filter design.
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