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This time we went to Wangwan Village, Xichuan Town, Qin'an County, where we started my social practice this holiday. Practice, on the one hand, is to apply the theoretical knowledge we have learned in school to objective reality, so that the theoretical knowledge we have learned can be used. If we only learn but not practice, then what we have learned is equal to zero. On the other hand, practice can lay the foundation for finding a job in the future. Through this period of internship, I learned something that I could not learn in school. Because the environment is different, the people and things contacted are different, and the things learned from them are naturally different. We should learn to learn from practice and practice from study.3. Some types, such as the core trading engine of the exchange, control the trading process. If multiple types can be created, the system will be completely chaotic. (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 following is an analysis of some examples that we need to pay attention to when applying singleton pattern in the development process.青青青木的帖子出来后，叽歪《绝代双骄》老套的人也不得不闭嘴了，《绝代双骄》霸主的地位似乎无可撼动。现在我们要专心对付刘邦，就不可再掉与轻心。5年前，由沈聪与铁森两人成立的“筑梦计划”小组，藉由一枚神奇的三角“天石”成功发展出能够让人类不老、不死的“筑梦计划”。“筑梦计划”实验的主导者—沈聪，不但有缜密的思考力与明快的决断力，还具备深藏不露的优异武术根基；是一个文武双全、至情至性的男子。其挚爱的女友—凌灵，曾因重大车祸导致智力丧失，后虽在精密的手术下恢复正常，但仍有复发危机，沈聪遂因此答应协助好友铁森发起“筑梦计划”，希望能为爱人寻得彻底治愈的方法。岂料，就在实验成功之际，位于雪山的筑梦实验室竟陡然发生爆炸，凌灵气绝在沈聪怀中，且除了沈聪之外的其余组员亦全数身亡。而爆炸案凶手唯一留下的线索是“X”李敬文摇头，苦涩地说道：爹不要把那些读书人高看了。