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Since Pizza is still an abstract class, when we create a subclass of FactoryPizzaStore, we should also implement a specific subclass inherited from Pizza. If we only create a subclass of FactoryPizzaStore without a corresponding subclass of Pizza, what does our pizza shop sell?Countries still keep their cards, so no one can know for sure which countries are capable of launching the largest attacks. As far as the United States is concerned, Russia is the biggest threat. The country has proved that it is both capable and willing to actively launch digital attacks.1. As a math student, I have studied math for four years, and I don't agree with the bibliography you gave at random. First, there is no step type and it is unfriendly to beginners. Your title and the purpose of writing this series are probably for Xiaobai to see. So, may I ask, a Xiaobai needs to see the principle of mathematical analysis? ? Is it necessary to look at Princeton Calculus Principle to learn artificial intelligence? ? In my shallow understanding, the biggest difference between mathematical analysis and advanced mathematics is the same theorem. High numbers only require that they can be used. Mathematical analysis is rigorous and will definitely give proof. However, for the mathematics needed in most artificial intelligence, you need to prove the correctness and completeness of this theorem in your work? ? I'm afraid the project will be closed long ago when you prove it. You replied to me that this is only a bibliography, not a recommended bibliography, but most of the following comments decided to give up when they saw the book list. If you put these books out, it will be instructive to those who read your articles. I think you are misleading people. Second, I have roughly deduced from the number of references you have made that you may not have a framework for the mathematics of the whole artificial intelligence, otherwise there would not have been such irresponsible recommendations. However, out of respect for you, I did not question your ability. I only gave a brief recommendation in the comments on the suitable math bibliography for beginners.朝廷六部全力配合，筹集军备粮草等物资。为了挽救MUSE，董事长沈岳峰(陶传正饰)特地延揽传奇的企业经理人纪文凯(炎亚纶饰)担任公司CEO，而纪文凯上任后，第一个和他对上的就是“青梅竹马”锺雨棠(曾之乔饰)。从山东农村考到上海的曹可陈（夏雨饰），结识了来自重庆的辣妹子丛小明（梅婷饰），这对经历爱情走向婚姻的新婚夫妻面临着来自有着不同生活背景的双方家庭，以及房子、车子等诸多物质欲求的种种考验。一个在来自农村的哥嫂和父母与妻子丈母娘的矛盾中辛苦挣扎，心怀梦想忍辱负重，蛰伏八年终圆梦；一个则面临在怀孕生子期间岗位不断被同事垂涎，被老妈和丈夫之间的矛盾搞得焦头烂额，但是在爱情的支撑下最终成为丈夫的精神支柱；曹可陈与丛小明组建家庭后的生活琐事也许远远不止是工作、事业，更多的则是不同的生活背景在现实生活中所衍生的重重矛盾……　　通过诈尸成功逃狱的黑桃Q与特务组织头目黄先生联络，黄先生给他提供了住处。公