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The design of PCB has always required that boards be distributed according to functional zones. In order to facilitate production inspection and maintenance, it is also necessary to define component numbers according to functional zones. The following component bit number partition definition rules are proposed for three-phase meters and end products:秦淼听了犹不信，还只管问。　　 明朝开国皇帝朱元璋出身贫贱，从没进过一天学堂，但却擅长用人之道，精通治理贪污腐败，不但提高了妇女、商人地位，而且光大 了华夏优良传统，而这一切，大脚皇后马秀英却起了至关重要的作用。马皇后苦心狐诣、忍辱负重；涤瑕荡垢，钩身致远。The Liskov Substitution Principle (LSP) is one of the basic principles of object-oriented design. The Richter substitution principle says that wherever a base class can appear, subclasses can certainly appear. LSP is the cornerstone of inheritance reuse. Only when derivative classes can replace base classes and the functions of software units are not affected can base classes be truly reused, and derivative classes can also add new behaviors to base classes. The Richter substitution principle is a supplement to the "open-close" principle. The key step to realize the "open-close" principle is abstraction. The inheritance relationship between the base class and the subclass is the concrete realization of abstraction, so the Richter substitution principle is the specification of the concrete steps to realize abstraction. --From Baidu"State Pattern Reconstruction"绿菠捂住嘴巴惊叫道：还有白眼珠白头发的人？两人说得热闹非凡。04　日清戦争