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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.你不怕死，咱们还要命呢。这才是关键处。In terms of curriculum content, such APP products mostly inspect a single knowledge point in the form of games. The curriculum system is relatively weak and lacks explanation and guidance of knowledge points.(1) Application Form for the Establishment of Fire Protection Technical Service Branches;Disadvantages of intermediary mode:亲朋故交，所有人的命运都承受着前所未有的考验……