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Class has only one instance. Q: How can we guarantee it? Answer: Private constructors are used to ensure that classes cannot be instantiated outside the class.In this practice, what makes me feel very much is the aspect of interpersonal communication. Everyone knows that interpersonal communication in society is very complicated, but I think it is hard to say clearly how complicated it is. Only through experience can we understand it. Only in this way can we have a deep feeling. The following is the research report on the social practice activities of college students in the countryside compiled by YJBYS. Read it!　　演艺界的乒乓球高手姜虎东和殷志源最先宣布出击。据悉，姜虎东是已经在多个节目中证明了实力的乒乓球高手，他本人也对乒乓球拥有自豪感和兴趣。放了一大滩血迹，然后将狗提起来，翻过院墙就跑了。MDT policies, guidelines and regulations are reviewed at least annually.《奇女子之人在江湖》一位是身怀绝技的山村姑娘，一位是成为黑帮老二的冷艳女卧底。阴差阳错间让她们相遇，相识，相知，一场江湖救赎，展开了一段过往的江湖恩怨情仇。令人啼笑皆非，令人胆战心惊。绝技功法现身江湖，究竟是对，还是错。一本神秘笔记能否揭开奇女子的心中疑团。