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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;至此，天启的粉丝已经不满足仅在启明上讨论令狐冲，他们也要出去显摆、得瑟。The favorable orientation of the policy and the continuous improvement of market awareness have provided entrepreneurial opportunities for children to cultivate their thinking ability and subdivide the track. The injection of capital is also accelerating its development, but at the same time, more and higher requirements are constantly being put forward for it.具体一些，依靠火药燃烧来推进弹药。Liskov Substitution Principle, LSP (Richter Substitution Principle) means that subclasses must replace their parent types. In other words, in the process of software development, after the subclass replaces the parent class, the behavior of the program is the same. Only when the subclass replaces the parent class and the function of the software is not affected can the parent class be truly reused, and the subclass can also add new behaviors to the parent class. In order to look at an example of violation of LSP principles, the specific code is as follows:项梁问道：李由和董翳呢？李由尚未到达雍丘。