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In the above code, we use three functions, order500, order200, orderNormal to handle its own business logic, If the current own function cannot handle things, We pass it to the following function to handle it. By analogy, Until there is a function that can handle him, Otherwise, the responsibility chain mode will leave the chain directly, telling that it cannot be processed and throwing an error prompt. Although the above code can be used as the responsibility chain mode, we can see from the above code that the Order500 function depends on functions such as Order200, so there must be this function, which also violates the open-closed principle in object-oriented. Let's continue to understand writing flexible and detachable responsibility chain nodes.　　文佳煐 饰演威基基的青年们那些年爱过的初恋“后岩洞女神”韩秀妍，婚礼当天受到突发性屈辱的秀妍和俊基重逢后，命运般地在威基基住下来。"Yes, even if you go underground, those who drill shallower can still be powerful. There is really nothing you can do about those who drill deeper. You can only stare and wait for them to come forward and come out before hitting. That is very dangerous. This is why many comrades were killed and bitten by them." Zhang Xiaobo said.C per capita living expenses of urban residents;2. Make the database into single-user mode名为三坪房间的钢琴师的青年在串流网站上发布演唱Piano Man的视频，点燃了周围人们的心，彼此的人生交错在一起，在不知不觉中，互相帮助、鼓励。该剧讲述了特警“小虎队”从接受考核组队，到成长为可以在繁琐的案件中独当一面的“钢铁战队”的故事。