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
DDoS Attack and Defense: From Principle to Practice (Part I)
这个真没有。
余真心是一款秘密研发的，专门服务于大龄剩女的恋爱型机器人，实习医生林梦楠[3] 阴差阳错间成为了这个产品的首位内测用户。余真心的热情追逐和悉心照料让林梦楠逐渐感到了快乐和依赖。林梦楠重逢以前的学长韩逸枫[4] ，余真心主动撮合，但也心生嫉妒[5] 。看着林梦楠和韩逸枫越走越近[2] ，余真心终于明白人工智能是不可能替代人类情感的，同时领悟到爱是理智，爱是放手。他开始有意训练林梦楠的生活、工作和学习能力。当林梦楠考完医师资格证出来时，他已彻底报废，静静的躺在了实验室里。[2]
In the first week of the competition, I will create a preliminary solution, which will be followed up and updated as the competition progresses. To do this, I must first have a certain understanding of the data and difficulties of this competition, and then study similar Kaggle competitions and related papers.
女人们见他们说正事，便移到一旁嘀咕些家长里短。
华夫人、唐伯虎两人就像做电视广告一样，表情真挚，声音高昂，介绍出‘一日丧命散和‘含笑半步颠的原料、制作手法、毒性，甚至味道。
So when you call again, On the contrary, the shooting rate is not as good as before, It's been going on for almost three minutes, The comrades in the positions began to be "recruited" one after another. I saw with my own eyes a soldier stung on the temple by this big wasp, where the bone was thin and the poisonous needle of this big wasp was severe, so the needle directly penetrated the bone and plunged into the head. Outside the temple, I could also see the poisonous needle revealing a "tail" and the rest all plunged into the bone.
However, with traced armour-piercing firebombs, the distance of efficient killing is more than 10 times, giving us more time to respond and buffer. When they get close, they will not be burned much, and the pressure on defensive positions will naturally be less.
立即播放
武德辉与厉藉赴大陆公干而走私出土文物，被解放军追捕并堕下山崖，误得元朝秘笈，又救了被天蚕网冷藏二百年的元朝云萝公主及侍俾小蛮，但也释放了二百年前天下第一邪派高手天残。云萝绝世聪明，回港后迅速精通多国语言，成为时代女性。辉学成如来神掌，迟只练成七旋斩。他们被天残找到，因辉没练成万佛朝宗，不敌天残，被废去全身武功。
某天晚上，酒店咖啡店店员平泽百百子（小西樱子饰）在酒店的空中瞭望台遇到了一个陌生的男人。两人像被吸附在一起一样反复接吻。明明恋爱经验为零，却一再追求那个男人的百百子，没过多久，才知道他就是在同一家酒店工作，堪称完美的精英酒店经理长谷慧（桐山涟饰）。百百子无法忘记那天晚上的吻，但是长谷的冷淡态度让百百子不知所措。与成熟男人的最甜蜜、最刺激的恋爱，现在开始了。
"DNF" continues the pattern of arcade horizontal fighting, and brings the sense of refreshment and attack into full play. Combined with a large number of elements in RPG, the battle in DNF has extremely high playability and playability.
为了留下充满回忆的拳馆，小艾报名参加了高额奖金的专业拳击比赛。因同场选手影星杨芸酒吧打拳视频的曝光，让比赛得到了前所未有的关注。
If you want to know more, welcome to Anhui Telecom Know Platform or Anhui Telecom Online Business Hall to ask questions, and more professional customer service will answer for you.
刘黑皮听了这话，黑脸更加黑了。
“换珠四宝”相爱相杀的搞笑故事
No.64 Singto
士卒们已经在收拾营帐，准备着出发上路，苏岸匆匆走过来，说道：大王，天已经亮了，派人过去看看吧。
改编自美国同名青春电影。
