文章对CPS的构成及主要特性进行介绍的同时，也对其在防爆电器中的应用进行了分析，并列举了应用实例。
In this article, it is introduced the structure and main characteristics of CPS, meanwhile, it is analyzed the application of ex electrical appliance with the example of its application.
列举一个应用实例，利用交比的不变性确定空间平面参数。
An application example is enumerated that the space plane parameters are confirmed based on invariance of cross radio.
阐述了二元相关法的基本原理；列举了几个应用实例；特地提出了应用二元相关法必须注意的一些问题。
This paper presents elements of two variable correlation method and cites some applied examples. Some important problems for application of two variable correlation method are specially proposed.
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