XQuery被非正式地设计为可以构造XML文档，而这些XML文档是通过对输入的XML文档进行一阶谓词演算得出的。
Informally, XQuery is designed to be able to construct any XML document that can be computed from input XML documents using the power of the first-order predicate calculus.
一阶加纯滞后或二阶加纯滞后，并且提出了时滞系统的模型参考自适应控制的设计方法。
And a design method of model reference adaptive control for system with pure lag is presented.
给出了求解串联校正网络的通用方法，并讨论了一阶校正网络的特性设计。
In this paper, a general method to solve the series connection tuning network is provided, and the characteristics design of one order tuning network is discussed.
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