There are other forms too. The educational television are providing services through the public broadcasting networks and through closed-circuit transmissions within school systems.

电视还有其他节目类型。教育电视节目为公共广播网和学校闭路传输系统提供节目。

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This paper presents the origin of the exploitation of the direct current pluse width velocity modulation educational system and its circuit, moreover, goes on the waveform analysis.

介绍了直流脉宽调速实验系统的开发由来及线路，并进行了波形分析。

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