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A) Object-oriented paradigm. That is, people's legendary thoughts. Encapsulation, inheritance and polymorphism, in my opinion, are slightly higher than if, for, etc., which are also grammatical problems. The three principles to master in object-oriented programming are Plato principle, Liskov substitution principle and Parnas principle. These three principles are actually very simple. Any principle that you find difficult to fall in love at first sight and quickly identify with is not a good principle.After her mother died, Li Lei always blamed herself and knew clearly that her life was not good alone. Why didn't she take her to Shanghai more strongly and why didn't she take her over earlier to see a doctor?本剧聚焦Theresa和Helen姐妹二人，她们害怕自己的孩子也许和社区里另一个小孩的失踪有关。AnnaMaxwellMartin和RachaelStirling饰演姐妹。这一段饭，他也吃的比往常多。城头兵士传话：倭寇狡诈凶猛。经好友刘明浩介绍，杨瑞参加了京师体校跆拳道训练班，他在那里认识了干杂工的安心。安心清纯的外貌，忧郁的眼神、迷一样的身世深深吸引了杨瑞。随着他们交往的增多，杨瑞渐渐知道了安心坎坷复杂的经历……而且，还是和在教科书里学到的历史完全不同的战国时代……