The characters and reality of double parallel system UPS, external bypass design and operation, and the Suggestions about the ordinary maintenance are introduced also.

介绍了并联系统ups的特性及其实现，现场外接旁路的设计与具体操作，以及日常维护中的问题。

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From these aspects of selection, appraisal, index, organization, maintenance and design, this article raises some Suggestions to subject navigation construction of college library.

从网络学术资源的选择、评价、标引、组织、维护、网站设计等方面，对高校图书馆学科导航建设提出了一些构想。

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Basing on the current substation automated system's operation maintenance management situation and the existed problems, the paper proposes some Suggestions on it.

本文针对变电站自动化系统目前的运行维护管理现状以及存在问题加以讨论并提出几点建议。

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