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电视剧《工人大院》讲述的是在大跃进年代，未婚先孕的农村女孩乔芳草和情人陆镇海在文化氛围浓郁的工人大院邂逅，陆镇海实现了自己的诺言，把乔芳草培养成了优秀的产业工人，他们的婚姻百回千转，屡遭坎坷，终成眷属的故事。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.　　《菜刀，又见菜刀》。菜刀网销售记录备案：第一天，卖出菜刀数：0把；第一周，卖出菜刀数：1把；第二周，卖出菜刀数：301把。买刀人：小马哥，郑浩南……板栗听了他的话，习惯性地就想上前揪他耳朵，就跟对黄豆等人一样。最后，返回故乡的延羽与伙伴们努力抗争，感动了故乡的人民，终于阻止了希特只要科技不要环保的破坏行为。正说着，一人进了牢房，轻咳一声，二人循声望去，正是胡宗宪。A program based on policy mode consists of at least two parts. The first part is a set of policy classes, which encapsulate specific algorithms and are responsible for specific calculation processes. The second part is the environment class Context, which receives the client's request and then delegates the request to a policy class. We first use traditional object-oriented to implement it.