[1] Duley W W.CO2 laser effects and application.New York:Academic Press,1976:174~235.
[2] 李适民.激光器件原理与设计.北京:国防工业出版社,1998:220~256.
[3] 郑晟,巩建平,张学.现代可编程序控制器原理与应用.北京:科学出版社,2000:7~12.
[4] Siemens A G.Simatic S7-200 programmable controller systemmanual.Germany:Siemens AG,2001:22~165.