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The core idea is: when the state of the object changes, it changes its behavior at the same time, which is very understandable! Take QQ for example. There are several states, online, invisible, busy, etc. Each state corresponds to different operations, and your friends can also see your state. Therefore, the state mode is two points: 1. You can obtain different behaviors by changing the state. 2. Your friends can see your changes at the same time. Look at the picture:3. Some classes, such as the core trading engine of the exchange, control the trading process. If multiple classes can be created, the system will be completely messed up. (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 "Three Represents" and "July 1 Speech" of the previous leader General Secretary Jiang clearly put forward the goals and basic principles that must be followed for the cross-century development of China's agriculture and rural areas. It has made a comprehensive plan for China's agricultural economic, political and cultural construction and formulated major policies and measures to promote agricultural and rural work. It is an action program to guide the whole Party and the people to build a rich, democratic and polite socialist new countryside. The successful convening of the "16th" National Congress of the Communist Party of China has made a series of decisions on rural development and has focused on leading the people of the whole country to a well-off society. The political situation is very good.(12.20 update)《业余侦探》打造国内首部侦探悬疑推理题材，以一部匿名投稿的连载惊悚小说，预言成为真实的连环谋杀案为主要线索，展现上世纪四十年代上海滩一个旷世奇案。患有神经和心理疾病的“变态探长”不可思议地成为杀人疑犯，艰辛逃亡并追查凶案，牵扯出一个个匪夷所思、不为人知的惊天秘密，涌现出无数神秘诡异、来路不明的各方人物，杀手之谜、身份之谜、巨大宝藏之谜，更有一段尘封三十年的灭门血案浮出水面。迷雾重重、悬念不断、错综复杂、扣人心弦，上演了一段精彩纷呈、引人入胜的大型侦探故事。《庭审专家 Bull》由Phil McGraw及Paul Attanasio编剧﹑Rodrigo Garcia负责执导，根据著名美国日间电视节目主持人兼人类研究专家Phil McGraw博士的真人真事改篇。Phil博士亦有提供法律咨询服务，在现实曾为奥普拉的「疯牛病言论 」作法律顾问。刚离开《海军犯罪调查处 NCIS》的Michael Weatherly饰演改编角色Jason Bull博士，他领导一间对陪审团进行分析，以制定辩护策略的公司Trial Sciences Inc.。他身材及智慧皆有，令到他很受异性吸引，不过他亦有十分冒犯人的直率性格。