国产欧美精品一区二区,中文字幕专区在线亚洲,国产精品美女网站在线观看,艾秋果冻传媒2021精品,在线免费一区二区,久久久久久青草大香综合精品,日韩美aaa特级毛片,欧美成人精品午夜免费影视

This article mainly introduced the definition, characteristics, basic structure, operate object and communication of OPC technique, and then discussed the application in some devise supervising and controlling system, at last pointed out that this technique would have a higher practical value in the fields of industry control.