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The fundamental reason for using design patterns is to adapt to changes, improve code reuse rate, and make software more maintainable and scalable. In addition, the following principles should be followed when designing: single responsibility principle, open and closed principle, Richter substitution principle, dependency inversion principle, interface isolation principle, composite reuse principle and Dimit principle. Each design principle is described below.Time relays are divided into two types: on-time delay type and off-time delay type, and their symbols are shown in the following figure. For the power-on delay type time relay, when the coil is powered on, the power-on delay type contact acts after the delay time (the normally closed contact is opened and the normally open contact is closed), and the contact immediately returns to normal after the coil is powered off; For the power-off delay type time relay, when the coil is powered on, the power-off delay type contact acts immediately (the normally closed contact is opened and the normally open contact is closed). After the coil is powered off, the contact will not return to normal until the delay time is passed.人皆有私心。Li Yifeng, born on May 4, 1987 in Chengdu, Sichuan, is a mainland actor, pop singer and film producer. He graduated from the School of Film and Television of Sichuan Normal University.该影片根据泰国歌曲《小船应该从岸边出发》而改编成电视剧，讲述一位喜好音乐的高中男生，有些压抑自己，总是很紧张，当下即将面临入学考试，但是他专业课方面很糟糕，家庭方面也给他很大压力，最终他选择了在音乐方面继续努力，还有幸得到了科学社团的学姐帮助，这也使得他们俩的关系开始亲密。小葱听了失笑：‘江山易改本性难移你没听说过？板栗本是调笑的，竟然真诈出他们送东西了，由不住就说道：淼淼，你送给葫芦哥啥了？我不管，你可不能偏心，也要送我跟小葱一样东西才成。周菡的大伯父笑道：王爷放心，今天我等什么也不问。