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1. The product life cycle includes introduction period, growth period, maturity period and recession period.A) Object-oriented paradigm. That is, people's legendary thoughts. Encapsulation, inheritance and polymorphism, in my opinion, are slightly higher than if, for, etc., which are also grammatical problems. The three principles to master in object-oriented programming are Plato principle, Liskov substitution principle and Parnas principle. These three principles are actually very simple. Any principle that you find difficult to fall in love at first sight and quickly identify with is not a good principle.The template method pattern consists of two parts, The first part is the abstract parent class, The second part is the subclass of concrete implementation. Generally, the abstract parent class encapsulates the algorithm framework of the subclass, including implementing some common methods and encapsulating the execution sequence of all methods in the subclass. The subclass can inherit the parent class and rewrite the methods of the parent class in the subclass, thus realizing its own business logic.双方就在水面上混战厮杀。一个处处碰壁的倒霉青年孙小健意外成为了挥金如土、脱离现实生活的浩天的私人助理，随同参加了泰国冒险主题旅行团，与一帮来自天南地北的团友，经历了一系列啼笑皆非、惊心动魄的生死考验.....Eliza Scarlet与苏格兰场督察联手解决了19世纪伦敦的犯罪问题。在这个男人的世界中，她需要一个伴侣。苏格兰场的侦探督察William Wellington，也被称为“The Duke”：酒鬼，赌徒和花花公子。Eliza和Duke将联手解决1880伦敦最黑暗的犯罪。