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伴随乾隆帝“禅位”钟声，“康乾盛世”降下帷幕。嘉庆皇帝，大清历史上一个悲剧皇帝，从父皇手中接过一个“千疮百孔”的帝国，在风雨飘摇中度过他的帝王生涯。在267年的大清历史中，嘉庆在位的25年只是这漫长岁月链条中短暂的一环，可他身处惊心动魄的动荡时代。康乾鼎盛达到顶点，大清江河日下，开始衰颓和败落；而西方世界摆脱封建桎梏，大踏步地走上资本主义殖民掠夺，给仍在昏暗中的东方古国带来危机与挑战。　　Re-understanding OO: Object-oriented programming is an idea to think about software design structure with object-oriented thinking, thus strengthening the object-oriented programming paradigm. Object-oriented features are encapsulation, inheritance and polymorphism. "Do these count?" . So from that beginning, when I design a class, I keep reminding myself of the following three points:Components and wiring should be evenly distributed on the PCB as far as possible to avoid being too concentrated in a certain part of the PCB, especially DIP devices, which is not allowed.There is only one instance in the whole mobile phone operating system, that is, the memory receipt.