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1, Chengyan Sichuan secret base materials, soup, auxiliary materials, fresh food materials, raw materials centralized collection and supply, quality assurance.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:Thank you for watching. I hope you didn't watch it late at night.The former is to query a DNS server for a non-existent server, while the latter is to query a real domain name.夜幕低垂，万籁俱静，六段穿梭时空的故事，古老而华丽的剧场，带领我们走进妙不可言的梦境里。该剧根据2020年全民抗疫涌现出的先进人物和感人事迹改编，由《逆行》《别来，无恙》《婆媳战疫》《幸福社区》《一千公里》《了不起的兔子叔叔》《同舟》七个单元故事组成。本作是出生在东京长大的女性的故事？主人公真野日出子的故事。疲于审判人而辞去法官职务的她，在距离东京120公里的太平洋上漂浮着一个岛？在大岛打开了第二扇人生之门。