This article analyses the main kinds, characteristics and shopping problems of projector, and does its common malfunction.
分析了投影机的主要类型、特点和购置问题，并对投影机常见的故障进行了分析。
The characteristics, construction techniques and common problems of cold in - place recycling technology with cement as a stabilizer are introduced.
介绍了以水泥为稳定剂的现场冷再生技术的特点、施工工艺及常见问题。
This paper introduces the types, characteristics and advantages of some common E-books, and points out some problems that need to be solved in E-books.
介绍了常见电子书的种类、特点及优势，指出了电子书仍需解决的问题。
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