The Liskov Substitution Principle (LSP) is one of the basic principles of object-oriented design. The Richter substitution principle says that wherever a base class can appear, subclasses can certainly appear. LSP is the cornerstone of inheritance reuse. Only when derivative classes can replace base classes and the functions of software units are not affected can base classes be truly reused, and derivative classes can also add new behaviors to base classes. The Richter substitution principle is a supplement to the "open-close" principle. The key step to realize the "open-close" principle is abstraction. The inheritance relationship between the base class and the subclass is the concrete realization of abstraction, so the Richter substitution principle is the specification of the concrete steps to realize abstraction. --From Baidu
L deadly second phase
且说秦枫，从皇宫出来，就去了侍郎府，先见了小葱，晚上又见到了下朝归来的葫芦和板栗。
Nine fairies
王爷已定下起兵谋反的时间，皇帝已察觉却不愿轻举妄动，苏灿为寻爱人而来，却遇与爱人一般模样的女子，她的出现却是要刺杀皇上，为了阻止被搅入这场政变，最终他做了改变人生的决定。
Fire protection technical service institutions shall not subcontract or subcontract fire protection technical service items.
50年代的德国,驻扎于Kaltenstein（冷石）的美军带来了崇尚个人自由主义的风气,因此两种文化开始猛烈的冲撞。。。
You right-click on the monster, and the white characters that appear are ordinary attacks.
在魔法力量的帮助下，工程有条不紊地飞速进行。可是，艳后的祭祀阿蒙格菲斯却不断从中作梗，艳后的任务能如期完成吗？
Catalytic dehydration theory: mainly refers to changing the thermal cracking process of fibers to dehydrate and prevent the generation of combustible substances.
Column Title: Zhengda Variety Show
彼时，张家老小都集中在上房偏厅，因为这里一目了然，其他屋子都翻了个底朝天，而公孙匡和梅子寒就在厅堂办差。
User Actions and Input Values
一日,皇宫一直没有人居住的“兰苑”宫内出现“鬼影”,并出现了一种不知是何物的红水.“兰苑鬼影”的出现,将人们笼罩在一种恐怖的气氛中.随后,供外国使节参观的存放在珍宝楼的国宝全部被盗,从长安用来参展的珍宝途中被劫,使的朝廷上下乱做一团……
What is the real demand of parents for the cultivation of their children's thinking ability at this stage?
Peripheral interface circuit part
1 枪男
要是我，我就买上一万本，这样我就有钱讨老婆了。
反清复明的西鲁天会得知此事后，也派遣帮会中的兄弟前去截宝。
