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Each object has its corresponding state, and each state corresponds to some corresponding behaviors. If an object has multiple states, there will be many behaviors. Then the judgment of these states and the behavior completed according to the states will lead to multiple conditional statements, and if a new state is added, the existing code needs to be changed. This kind of design obviously violates the principle of opening and closing, and the state mode is used to solve such problems.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.20世纪90年代中期，一个北方名叫嘉城的小城里，从外地搬来的宁檬，转学进入了嘉城一中的文科尖子班。作为新来的班花，宁檬很快就成为了众人眼中的焦点。对此，班里的男生们欢呼雀跃，而女生们却大多表现得颇有微词，于是一场令人啼笑皆非，而又略带青涩的高中校园“宫斗”大戏，就此稀里糊涂的开演了！ 　　正是那个青春叛逆的芳华，正是那个情窦初开的季节，正是那个对一些似懂非懂的年纪……大方倩丽的宁檬，阳光帅气的孙雷，活泼可爱的安芯，淘气捣蛋的马超，工于心计的徐丽丽，痞气十足的社会青年乔飞龙……或许在这些鲜活的角色中，就会有你、有我，也有他或她当年的影子！该剧是一部奇幻电视剧，讲述没有选择成为妻子或母亲的当今女性的真实生活和成功故事，将描写门户网站业界激烈的竞争故事。4. Ball Games　　两人梁子从小开始结下，学生时代每次都是锺雨棠占上风，出社会后，锺雨棠进入人人羡慕的Muse彩妆集团工作，纪文凯打零工打到国外去了，没想到风水轮流转，纪文凯摇身一变成为CEO，锺雨棠却被调到“废材处理中心”，成为业务三课的一员！两人又该如何相处？这对爱鸟是否找到他们职场、情场的春天？