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The above is only a model of "Long En" bicycle, If you need to generate other types of bicycles, Other subclasses can be written. The most important advantage of factory mode is that some of the same methods can be implemented. We can write code in the parent class for these same methods. If we need to implement specific business logic, we can rewrite the parent class's methods in the subclass to implement our own business logic. In terms of professional terms, there are two points: First, weaken the coupling between objects and prevent code duplication. Instantiating a class in a method eliminates repetitive code. Second: Repetitive code can be written in the parent class. Subclasses inherit all member attributes and methods of the parent class. Subclasses only focus on implementing their own business logic.iKON网络团综《iKON的心动青春旅行》2018年7月4日首播~！由YG与某手机平台共同投资制作的iKON全新团综《iKON的心动青春旅行》将于今天下午8时首播。该节目是一档成员们前往夏威夷展开的旅行真人秀治愈节目，共分为10期，每周三、周六下午6时播出。In essence, classification is to find the common points and differences of things in our thoughts. It is the basic method and ability for us to know and understand the world. On the basis of classification, it is possible to judge and reason, and to form concepts and make decisions. Classification requires comprehensive demonstration activities such as association, analogy, reasoning and extension, and is the basic cell of thinking.现在大家都这么看脸吗？我表演得已经非常认真了。　　本片荣获2004年Fangoria（美国恐怖电影杂志）链锯奖最佳男配角奖（Sid Haig）、2004年葡萄牙奇幻国际电影节最佳特效奖。In the "Parameters" tab of the "Block Writing Palette", click "Flip Parameters" again, AutoCAD? The command window at the bottom prompts "Specify parameter position or [name (N)/label (L)/description (D)/palette (P)]", captures and clicks on the corner below the triangle on the graphic; The command window then prompts "Specify the endpoint of the projection line" and drags the mouse vertically for a certain distance before clicking the mouse. The command window prompts "Specify Tag Position" and clicks again nearby.