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
I nodded at this passage, Understand that what Zhang Xiaobo said is indeed reasonable, It is not a lie, Here I think it is necessary to give you one thing about popular science. So we have to say something digressive: The result of a real bullet hitting a petrol tank is not the same as that shown in most movies. One shot can explode the petrol tank, But this is not the case, Although a pure metal projectile will rub against the air at a speed of hundreds of meters per second to generate equivalent heat, And will produce sparks after hitting the metal oil drum, But none of this is enough to ignite petrol, Especially for gasoline with a large total amount, to ignite gasoline, please remember one thing-open flame must be used. In addition, gasoline is a flammable item, but it is not an explosive item in the true sense. Only after reaching a certain total amount can explosion be caused. If the total amount is insufficient, it can only cause combustion without explosion.
在这个弹药充足，潜藏着不法威胁的小镇里，海姆斯沃斯将演绎经典西部英雄比尔·希科克与他的枪战传奇。
Bring the handling materials and fees (cash only) to the outlets for handling.
因眼角有疤而封闭内心的苏叶，在姥姥离世前得到了一支可以穿越时间的口红。苏叶利用口红改变了过去，重新拥有美貌，从质监局跳槽到了4S店工作，并在危机中一步步往上爬。在此过程中，苏叶遇到了华鼎集团CEO韩绍，一个和她眼角留疤有着密不可分的关系的人。苏叶改变过去恢复美貌的同时也严重影响到了韩绍的人生轨迹。另一边，追了苏叶数年却没有一丝进展的律师纪肖，成了韩绍私人法律顾问。苏叶穿越回高中，和失联多年的闺蜜丸子再次见面。现实生活中，两人再次相遇。当年丑笨的丸子居然成了美妆博主，还对苏叶充满了不屑和恨意。在苏叶找寻并解决和丸子的矛盾中，四人关系逐渐亲密。看似平静的表面下，一场针对华鼎集团巨大阴谋正悄然酝酿。
她们之间，没有任何道理可讲，有的，只是各为其主。
来了! 张宝利，讲述改变身份两个女人和他们的母亲的故事的作品。生活贫困而一天早晨富人家的亲生女儿的张宝利(吴涟序)吴涟序扮演的主人公张宝利扮演出生的秘密和贫穷,成为成功的韩服设计师女性。吴彰锡作为,冷静理性的男子商住宇一角。
其实众人在乎不是断水，而是尹旭的神上的一些神秘的东西。
某日，妖界一众妖族忽感妖力突然衰减，四位年轻妖族成员，熊、狐、猴、龟被妖族族长唤至洞府。从牛马二长老口中，四妖得知一个惊人秘密。原来支撑妖界的界心被盗。如不迅速寻回，不但众妖无法继续修炼，妖界也将暴露于世间。届时不啻为妖界灭顶之灾。妖界挑选熊、狐、猴、龟四妖前往人间，寻找界心，拯救妖界。
纯洁的特蕾西在陶尔哈姆莱茨区的宗教家庭长大。她准备充分发挥自己的潜力，而第一步便是脱离处女。
9. Click to Download: Communications Department's Electronic Signature Change (July 12, 2018). Rar
Some stations will also have touch operation screens, which can provide English, Japanese, Chinese and Korean language services. Manaka can be used for payment, which is very convenient.
然后小鱼儿、花无缺、铁心兰三人成了结拜兄弟。
The Nature of Deliberate Practice
兄弟二人双臂缠在一起，交换了坚定的眼神。
谢谢你，让我遇见了爱情，也谢谢你，让我遇见了更好的自己。在古老的罗马街头，平凡的黄曼曼（黄尧饰）意外遇见了与自己天差地别的偶像彭柏杨（刘迅饰）。本无交集的二人却在罗马上演了一场浪漫而又惊喜的恋爱之旅，整个城市都充满爱的味道。但事情的发展并没有他们想象中的那么美好，现实生活又将两人拉回原点。时过境迁，他们心里是否还记得那天在罗马街头对彼此许下的诺言？
你们也不必劝我了，我的命都是写好的。
The students of Cambridge University in England are the founders of modern football.
汽车世界中，一年一度的活塞杯再次拉开序幕。红色跑车“闪电”麦坤和“冠军”、“路霸”是冠军最有力的竞争者。作为新人，麦坤具有极高的天赋，同时也是一个目空一切的家伙。经过紧张激烈的对抗，这三辆车同时冲过终点线。由于无法判定最终优胜者，组委会决定一个月后在加州洛杉矶召开一次只有这三辆车参加的殊死战，只有最后的胜者才能捧得活塞杯。
葫芦等人都跨上马背。
