Abstract: this paper mainly introduces the PN of solar cell structure, working principle, classification method and improving the efficiency of conversion.
摘要：该文主要介绍太阳能电池的PN结构、工作原理、分类和转化效率的提高方法。
The functions, working principle, classification of UPS and EPS, as well as the main characteristics of the common type of back-up, on-line, on-line interactive UPS are expatiated.
摘 要 分别介绍了UPS和EPS的功能、工作原理、分类，以及常见的后备式、在线式、在线交互式三种UPS的主要特点。
The principle, classification and main technology of rapid prototype have been introduced in comparison with conventional working processes.
将快速成形技术与传统加工方式进行比较，介绍了快速成形的原理、分类，以及主要的快速成形工艺。
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