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3. Some classes, such as the core trading engine of the exchange, control the trading process. If multiple classes can be created, the system will be completely messed up. (For example, if there are multiple commanders in an army who command at the same time, there will definitely be a mess), so only by using the singleton mode can the core transaction server independently control the whole process.The system/organ/disease discussed can be added before MDT to become the complete MDT name, such as upper digestive tract MDT and breast cancer MDT.　　Pt-218: 第二次世界大战的反叛者，不仅讲述了一个真实的故事，而且告诉了我们1942年发生的事情的细节。在二战的鼎盛时期，大西洋变成了一个致命的战场，美国潜艇与德国军队不断的轰炸作战。农村出身、长相平平的于文雅，嫁给了帅气的“钻石男”髙冶平。但在婚后的生活中，于文雅始终没有获得高家人的认同，公公婆婆百般刁难，甚至极力想促成两人离婚。小姑子高文平在经历感情挫折后，爱上了于文雅的哥哥于志忠。两家人极力反对这桩婚事，于文雅的妈妈为女儿出气处处刁难高文平。高冶平和于文雅不但没有离婚，反而搬出高家。于文雅在失业后有了新的工作变成职业女性。高恒源病危，高冶平和于文雅无奈离婚。高恒源康复后，终于想通了，两家人愉快和睦的围坐在一起，过上了幸福的生活。If Columbus's last great geographical discovery expanded the physical space of human beings. Then this great geographical discovery has expanded people's digital space. In the mathematical space, establish a new commercial civilization, thus discovering a new mode of wealth creation and bringing new wealth space to human society. Cloud computing, big data, Internet of Things and block chain are ships entering this digital space, and artificial intelligence is the sail of that ship, Columbus sail!"I am from Beijing, Ancestors raised dogs for the imperial court, The dog was not the pet of the nobles, Even royalty racing dogs, One by one, They are very expensive, In terms of seniority, it is a matter for my great grandfather's generation to move forward. Therefore, the family has inherited dogs from generation to generation, I have also saved up a lot of ancient books and materials in this field, Some of them were found and burned in the period of breaking the Fourth Old Age. Also because this was criticized during the Cultural Revolution, But it doesn't matter, The key is that I can look at dogs. I have been growing up in this environment, so I have had special feelings for dogs since I was a child. You see, unless I have to use it, for example, now, otherwise I never say the word "dog" but only "dog", because this is a kind of respect for dogs. This is like describing that it is normal for people to talk about "a", that is, to talk about "only" or "bar", that is to swear.根据赵树理小说《三里湾》改编。糟华北农村的三里湾村正筹划着开渠、护社，支部决定让村长范登高去动员富裕农民糊涂涂让出他家祖传的刀把地。范登高不但不予理睬，还带头反对。范登高的女儿灵芝与糊涂涂的儿子有翼，是村中仅有的两个中学生，他们和自己的父辈进行了斗争。在青年们的努力下，三里湾开渠、护社的事终于成功。灵芝和有翼也分别实现了自由婚姻的心愿，找到了各自的幸福。