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B) Design principles. Many people have listed seven principles, such as single duty principle, opening and closing principle, Richter substitution principle, dependence inversion principle, interface isolation principle, composite reuse principle and Dimit principle. LSP, I elevated it to one of the three cornerstones of the object-oriented paradigm; Single responsibility and interface isolation are mainly used as the principle of responsibility division in object-oriented analysis/OOA, which you can not pay much attention to at this time. Relying on the inversion principle, I throw it away as garbage, because the opening and closing principle or directly "relying on abstract type principle" already contains the essence of relying on the inversion principle, while the dross of relying on the inversion principle is inherited by IoC. Of course, the pullback, I emphasize very much. Therefore, you need to master the abstract dependency principle (OCP), one-way dependency principle (including the learning of callbacks) and the minimum dependency principle (composite reuse principle, Dimit rule).故事发生在东北农村。剧中表现了农民在改革大潮冲击下离开黑土地进城打工，给农民带回了新思想，新文化，新技术。在党富民政策的鼓舞下一些农民又回归土地的心迹变化。真实的反映出农民在社会环境中城市反哺农村，农民一心一意奔小康的清明上河图景象。　　三德子法印离开之后，康熙与林风儿、小桃红等人被绑匪用陷阶抓住，牢狱之内，绑匪欲对林风儿非礼，被康熙救起，二人互生好感。到了交赎金的日子，康等三人被带到一个叫双龙谷的地方，谁料，前来收赎金的竟是巡抚和知府大人，康大怒，巡抚见事情败露，欲杀康熙，幸三德子法印带兵及时赶到，将巡抚等人悉数抓获，救出三人。康熙将林风儿封为新宜妃，带回皇宫。中国首部揭露医疗黑幕纪实。本剧以客观的视角，纪实的手法，全面系统展示了当今医患矛盾的现状。在20多个案例中，医院如何不负责任坑害患者，患者为自己利益如何讹诈医院，医药代表与大夫的钱色交易，医疗改革的艰难，人道主义与经济利益之间的尴尬，医疗事故处理和手术风险的法律问题等等，是我国第一部深刻的直面医疗现状的电视剧…………那你先跟他们说一声，别又掉下去了，我们都没药治，也没布包扎了。京都府衙的差役也全部出动，维持治安，劝解百姓散去。首先这名字就是胡闹，摆明就是在哗众取宠。