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Clarify the personnel arrangement for MDT diagnosis and treatment decisions to be implemented after the meeting, and record this.第一，巴蜀琴氏还是顾念昔年和秦国的旧情，李斯信函起到了一定的作用，拉拢一事已经有些成效。　　能承受什麽？B) It is suggested to start from a simple scene and discover or design a certain pattern by yourself. From this, you can understand how the model solves the problem. In this way, the model becomes your own thing, and you will not have the problem that it is easier said than done. All design patterns are just the application of basic principles and concepts in specific occasions. You may not know the name of a design pattern, but you know all its advantages, disadvantages, variants and applications. Seeing mountains is not mountains, seeing water is not water.OCP (Open-Closed Principle) principle emphasizes that a software entity (class, function, module, etc.) should be open to extension and closed to modification. That is, every time there is a change, the behavior of the existing type should be enhanced by adding new code instead of modifying the original code.