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A市是国内发展快速的一座城市，这座城市里有数家大型企业，腾华集团受到竞争对手强力打压，股票持续下跌，即将破产。CC公司是谈判界的翘楚，CC派出精英谈判师夏初熙为滕华救市。夏初熙在排查过程中发现针对腾华的不仅有商业对手公司，还有周达华的前妻沈琴从中作梗。沈琴因爱生恨，不惜与腾华集团的对手都汇集团合作，意图搞垮腾华。The HTML code is as follows:First, create a common interface between the two:要知道，小时候为了这个名儿，他跟同村的少年不知打过多少场架，因为每每小伙伴们争执起来，就不喊他玄龟，而是骂他小王八。The principle of opening and closing means opening to expansion and closing to modification. When the program needs to be expanded, the original code cannot be modified, but the original code should be expanded to achieve a hot plug effect. Therefore, a summary of one sentence is: in order to make the program scalable, easy to maintain and upgrade. To achieve this effect, we need to use interfaces and abstract classes, etc. We will mention this point in the later specific design.This is the author's tank skill match: