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/ready珊瑚看着上房的门帘，再也不想进去了。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.《喋血边城》是一部讲述辛亥革命时期发生在竿城凤凰的悲壮历史故事，全方位展示了湘西的地域风情，彰显了湘西人特有的坚贞不屈的品格，充分肯定了湘西人民在中国革命历史进程中做出的巨大贡献。Non-metallized holes must indicate the aperture and quantity; The copper thickness of the metallized hole is ≥ 25 um.把这些东西取出去反倒不好，最好让顾涧亲自来看。