王老师一边讲课一边观察学生

　　派出所长刘大林带领学校老师、学生家长组织学校自救，在他的努力下就出了许多掩埋在废墟里的孩子，然而他自己的儿子却因为压在废墟中太久得不到及时救援而离去。刘大林强忍着悲伤继续指挥自救，他把他的父爱给了所有被压在黑暗中的孩子们。There is not much requirement, just an average promotion.The scenarios used in the command mode include: sometimes it is necessary to send a request to some objects, but I don't know who the recipient of the request is or what the operation of the request is. At this time, I hope to design the program code in a loosely coupled way; So that the request sender and the request receiver eliminate the coupling relationship in each other's codes.The report posts have been deleted... You are in the same group.The eldest son of the LinsQ: Will you follow certain steps in the competition?Skin patterns are designed to resolve dependencies between classes and class homes, Like spring, the relationship between classes can be configured into the configuration file, while the appearance mode is to put their relationship in a Facade class, which reduces the coupling degree between classes. There is no interface involved in this mode. Look at the following class diagram: (Let's take the startup process of a computer as an example)