需要使用一种关系数据库作为Web应用程序的后端。
A relational database back end for a Web application is a given.
今天，人们会自动使用关系数据库，如果他们要建立一个商业应用。
Today, people automatically use a relational database if they want to build a business application.
边际网损系数法是当前各国电力市场应用较多的一种方法。
Marginal loss coefficient method is applied in several electric power market at present.
边际网损系数法是当前各国电力市场应用较多的一种方法。
Marginal loss coefficient method is applied in several electric power market at present.
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