本文介绍了电源滤波器选用过程中涉及的常用参数，着重介绍了通讯行业中所运用的系列产品及针对其使用特点引申出的最新型滤波器。
This article introduce refered common parameter when choosing the power line filters, especially introduce the series products in the communication industry as well as the latest filters.
从产品、质量、服务质量的概念出发，引申出移动通信技术服务质量的内涵及其相关因素。
After explain the concepts of product, quality and service qualities, I talk about the connotation of technical service quality and correlative factors.
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