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(a) Failing to test, repair and maintain building fire fighting facilities and fire extinguishers in accordance with national standards and industry standards;Http://www.jiemian.com/article/2007883.htmlE the final CAD drawing leaves only one form of lines and necessary layers, such as doors, windows, steps and other layers that need to be modeled.《大案侦破警示录》是中国内地系列大案侦破电视纪实片小葱嗔怪道：葫芦哥哥，你糊涂了。After studying the design pattern during this period of time, I still have a lot of feelings, because when I am writing code now, I often think about whether I can use any design pattern to refactor here. Therefore, after learning the design pattern, I feel that it will slowly affect the way you think about writing code. Here is a summary of the design patterns. First, all the design patterns can be sorted out. Second, an index can be made to help everyone collect.