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Whether you are a new salesman or an old salesman, In the process of sales promotion, we must treat each customer with a sincere attitude, take the initiative to think of the customer, take the customer's needs as the focus of work, and we must do a good job in the whole process of pre-sale, in-sale and after-sale service, so that the customer can recognize your work and make friends with you, so that you will gradually grow from a new salesman to a successful salesman.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黎章见女书生喜滋滋地单脚一个旋转，朝身后书童鼓起桃腮。2001年4月28日晚，衡州市毗临闹市区的范光胡同巷口突发枪案，天鸿公司总经理吴天被人乱枪打死在自己的红色三菱跑车内，市公安局主管刑侦的副局长徐国庆接报匆匆赶到现场，组织警力展开调查，发现被害人吴天背景极其复杂，与许多人恩怨极深。警方在调查过程中发现了吴天被害的多种可能性，经过条分缕析案情渐露端倪。徐国庆感觉到这是一起涉及黑势力团伙恩怨的仇杀事件，并且渊源极深，遂着力对本市黑势力团伙展开调查。警方循江湖恩怨抓捕了一批横行衡州的黑团伙成员，经调查得知，盘踞桥北一带的黑势力团伙头子刘华强的弟弟刘华文不久前曾被人打成重伤，似为另一股黑社会势力封飙所为，警方在调查刘华文时，刘华文三缄其口，只字不吐被害原因，而此时，刘华强在两年前已因伤害他人潜逃，封飙亦在吴天被杀后逃离本市，徐国庆将刘文强列为重点，展开追捕她可没胡说，夫妻只要相和，想不旺家也难。《获嘉青年》是获嘉90后青年导演强子创作的河南方言网络迷你情景剧，该片由河南导演强子全程策划、导演、拍摄、制作，获嘉网络红人白小墨主演，白小墨在片中上演现实中的获嘉青年的各种搞笑生活，一定让您笑翻天Look at the code of the database connection pool: