In this paper, first introduce the current situation of the use of the heaters, then sort out the information of the principle and the classification and the application.

本文首先介绍了国内外使用汽车加热器的现状，就其工作原理、分类和应用进行了总结整理。

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This paper first briefly introduces VOD's principle and application, then presents a design of VOD server software, and particularly analyzes the system control, signaling and play control.

本文首先简单介绍了VOD视频点播的原理，然后给出了一种具体的服务器的设计方案，其中详细分析了系统控制、信令功能及播放控制部分。

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This chair first introduces the structure and types of optical fiber, then describes transmission principle, characteristics and application of optical fiber.

首先介绍光纤结构和类型，然后阐述光纤传输的原理、特性和应用。

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