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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).First of all, I'd like to tell you an example of great success in learning English through deliberate practice.本作为2009年制作的3D版本动画片。其内容依托“周兴商灭”的历史背景，用武王伐纣为时空线索，从女娲降香开书，到姜子牙封三百六十五位正神结束。结合历史，寓教于乐。项羽对此似乎很是自信。　　不仅仅有相互之间的调侃、戏谑、捉弄，也更多了份相互鼓励、帮助、扶持。有美好，有欢笑；有失落，有惆怅；有努力，有奋斗，爱情公寓一如既往的见证了大家的青春与成长，无论是一菲、小贤、关谷、悠悠、子乔、美嘉、益达还是展博，大家的故事...王翠翘威望实在不假，徐海入狱之时，正是她维持运作调息关系，合作分成等一应事宜，首领们都只有找她才放心，如今王翠翘谈了这买卖，大家才算放心。