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The 23 design modes, in fact, the predecessors have summed up the ways to solve the problem. Their aim is to ensure the low coupling and high cohesion of the system. The principles guiding them are nothing more than the design principles of packaging change, single responsibility, interface-oriented programming, etc. After that, I will continue to share my WCF learning process. Although there are many WCF series in the blog park, I felt that it was not necessary to write them before, and I felt that I could use them. However, I did not write them. I always felt that the knowledge was not my own and I did not feel in-depth. Therefore, I still want to write such a series. I hope all bloggers will support me more.团长兼政委周国华率领的铁山英雄团在东北战场浴血奋战还未休整，就奉命秘密入关，日夜兼程直奔北平。连长乔震山带领红四连取捷径协助华北野战军包围国民党守备3军，途中与李昌毅指挥的国民党守备1军遭遇，经过激烈战斗，守备1军撤回北平城内，乔震山在追击过程中意外与已成为李昌毅贴身卫士的双胞胎弟弟乔二宝相遇。乔震山原名乔大宝，多年前与乔二宝失散，后参加革命，成了著名的红四连的连长。乔二宝在危难之时由李昌毅所救，并留在其身边做了贴身警卫。对长官的感激和愚忠，对兄长的牵挂和思念，让乔二宝左右为难，始终在忠诚和亲情之间无法取舍……柳繁瑜是国民党抗日名将李昌毅的养女，刚从美国留学回国，在父亲的部队里当军医。在随军撤回城时，因抢救大火中的村民与同在救人的乔震山相遇而被俘。她在与乔震山的接触中，逐渐被我军同志间兄弟情深、热爱百姓的行为所感动，被乔震山的机智与勇敢所吸引……柳繁瑜回到北平城后帮助周国华、乔震山完成了入城侦查的任务，并为李昌毅的最终起义做出了贡献。平津战役即将打响，李昌毅代表的傅系部队和国民党中央军都Simple test classes:莫名的，周星河生出一股悲愤，他咬咬牙齿，沉声说道：是的，大家都说我不适合当一个演员，我根本不会成功。　努尔特之王计划窃取夜间动物园的颜色，使动物处于极大的危险之中！而夜间动物园管理员威尔和他的朋友能拯救夜晚动物园吗？影片讲述两个朋友的攀岩冒险变成了一场可怕的噩梦。凯莉用DV镜头捕捉到她最好的朋友被谋杀的过程后，她成为了这群朋友的下一个目标，他们为了不惜一切代价销毁证据决定追杀凯莉。凯莉为了活下去必须开始了一场危险的攀登，她的生存本能受到了考验......