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根据原理不同，预紧方法可以分为哪几类？每类请举出至少两种实例。
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It is generally thought around the world that theinhabitantsof large cities are ruder than their fellow citizensfrom smaller towns or the countryside.
It’s common to hear people on the bus or subway talking on their cell phones very loudly, being a nuisance to those around them.
请提交一份自我心理成长报告（1000字），回顾、总结学习《大学生心理健康教育》课程收获、心理成长与感悟。
下面既是中华民族的传统美德,也是我国公民道德建设的重点,还是社会主义核心价值观的一条重要准则是( )
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