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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 Baidu10. The stock is very cheap and has fallen a lot. It is not the reason for you to buy it. It will never be! He may also be cheaper!By default, it is installed on disk C of the system disk bar, and it is directly hit. After all, it is 150G when dividing the disk. You are free to do so.ABC官宣正式续订《神盾局特工》第六季！不过往季都有22集而本季却只有13集。1931年，九一八事变爆发之初，日军为战争需要，在东北地区疯狂掠夺矿产资源。爱国将领遗孤杨凯楠，阴错阳差地卷入了日本关东军阴谋夺取东北某地区金矿的阴谋中。国恨家仇，杨凯楠在中共共产党员陆先生等人的感召之下，与多位爱国志士团结在一起，组建了一支抗日游击队。在她的指挥下，游击队与阴险毒辣的日本关东军特务头目石原及其属下，展开了一场艰苦而惨烈的斗争。在对敌战斗中，杨凯楠众人多次陷入绝境，又多次在我党党组织的帮助之下化险为夷。最终，杨凯楠和她的战友战胜了强敌，保住了中国的金矿，她本人也在共产党人坚决抗日的决心和气魄感召之下，光荣入党，并率领部队加入到东北抗日联军的队伍之中，开始了新的征程。　“干将莫邪”是春秋时期铸剑大师干将、莫邪夫妇呕心沥血、用生命和旷世爱情冶铸而成的雌雄神剑。后因吴王逼追此剑，干将莫邪不忍分离，两剑倏忽间化作清烟，消失在尘世之间。千百年来，人们纷纷寻找神剑的踪迹……欢迎走进iTunes大热真实罪案播客的台前幕后。