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周夫子去了宫中，还没回来，周菡让周篁出来见他，自己却没露面。Standard Answer: Flight Control, Civil Aviation, Public Security112. X.X.26(3) Vision: Both eyes have not undergone any surgery, and the naked vision of any eye (according to the C-character visual acuity chart) is not less than 0.3, without color blindness, color weakness, strabismus, severe trachoma or trichiasis;然而，白凡那边缺少证据审不下去，他只得将童侍郎先拎了出来。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:挤垮首创者，又不是只有启明一家，大家早已见怪不怪了。