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Each object has its corresponding state, and each state corresponds to some corresponding behaviors. If an object has multiple states, there will be many behaviors. Then the judgment of these states and the behavior completed according to the states will lead to multiple conditional statements, and if a new state is added, the existing code needs to be changed. This kind of design obviously violates the principle of opening and closing, and the state mode is used to solve such problems.The command window at the lower part of AutoCAD prompts "Specify Starting Point". Click above the elevation character to place the attribute in the appropriate place, as shown in the following figure.　　天兵三号叶大同(钱君仲饰演)，一讲话就结巴，却拥有惊人的口技才华。当众新兵巴不得放假出营，到福利社把妹吃喝玩乐时，为什么大同却宁可待在成功岭受训？他到底有什么特殊的背景身份？本剧是对《同志亦凡人》英国原版的重塑，故事发生在美国新奥尔良，讲述一群朋友的生活在一场悲剧后发生了改变。　　有道是一朝天子一朝臣，登位之初，乾隆对李卫一点儿也不喜欢，尤其看不惯李卫身上的混混气。碍于是前朝老臣，能留给几分面子就已经不错了。李卫何等聪明，乾隆又是他在雍亲王府里看著长大的，知道这个新皇帝和雍正的行事为人全然不同，所以从一开始，他就决意辞官，回家种地去。嗯，也就紫茄温柔沉静些，有点闺秀的样子。英武帝见他欲言又止，便收住话头，问道：王爱卿有何谏言，但说无妨