前者的

First, with a glance, find out what you get is a cable specification, different specifications of the cable has its own different standards and purposes, the standard three-line "CAT3", bandwidth 10M, for 十兆 network, currently has eliminated the basic; five lines of the standard is "CAT5", bandwidth 100M, the following apply to hundreds of megabytes of network; super standard five-line "CAT5E", bandwidth 155M, is now mainstream products; the standard six-line is "CAT6", bandwidth 250M, for the erection of gigabit networks, the development trend of the future.

先是用眼看，搞清楚你拿到是什么规格的网线，不同规格的网线都有自己不同的标准和用途，三类线的标准是& CAT3&，带宽10M ，适用于十兆网，目前基本已淘汰；五类线的标准是& CAT5&，带宽100M ，适用于百兆以下的网；超五类线的标准是& CAT5E &，带宽155M ，是目前的主流产品；六类线的标准是& CAT6&，带宽250M ，用于架设千兆网，是未来发展的趋势。

In chapter 3,by means of Comparison Theorem,we investigate the persistence of a prey-predator system with diffusion and delays .

在第二章，我们运用独立子系统方法考虑了一类具有生理阶段结构的竞争捕食-被捕食系统正周期解的存在性及其全局吸引性。