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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.秦文天和海兰是经济发展银行的同事，上下级关系，两家对门而住，关系融洽。秦文天一家三口过着殷实的幸福生活：秦文天年轻有为，仕途平顺；妻子谢婉婷是个温婉娴静的妇产科医生。对门而住的海兰一家，老公孟三力是出版社的编辑，有着小康之家的闲适温馨。然而，秦文天意外的“撞人”事件，把秦文天和海兰卷入了绯闻的漩涡……The "Learning Book" section contains 295 works or related counseling materials by Marx, Engels, Lenin, Mao Zedong, Deng Xiaoping, Jiang Zemin, Hu Jintao and Xi Jinping. Among them, there are 63 booklets of Xi Jinping's important speeches, 7 books of Xi Jinping, 20 excerpts of Xi Jinping's important discussions, and 18 guidance materials for Xi Jinping's new era of socialism with Chinese characteristics. For example, seven Xi Jinping's works are "Xi Jinping Talks about Governing the Country (Volume I)", "Xi Jinping Talks about Governing the Country (Volume II)", "Knowing and Loving Deeply", "Getting Rid of Poverty", "Zhijiang Xinyu", "Taking the Lead in Practice" and "Being a Jiao Yulu-style Party Secretary".Beautiful faces, hot songs and graceful and dynamic jumps will attract the attention of audiences all over the country and even at home and abroad.云影和刘氏齐声喝止：嗳哟。8. Vessels that do not use the traffic separation scheme area shall be as far away from the area as possible.