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C. Figure skating: single skating, double skating and ice dancing."Recommended"? Sharing an Internal Growth Case刘蝉儿瞪大眼睛，心道，那你去集上买呀。A4.1. 3.1/Distant vision.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.　　入伍后，秦观变身魔鬼教官，要求严苛，新兵训练结束，三位同学一起被分到新组建的特勤第八组，队长正是秦观。