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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.Fourth, due to the need to monitor teachers' course arrangement and class attendance online, with the increase in the number of students, the technical requirements for teacher management are higher.This kind of story and details are everywhere in this book. Historians know that the modern history of China is a dry fact, and the aspects provided by Aban, from the unique perspective of American journalists, are fresh and juicy, and are not well known to us or common to us, thus filling in the gaps, providing references and making history fuller and more complete.刀枪齐出，朝着章邯的河南军招呼上去。　　里沙一直梦想着能有一场很甜很甜的恋爱,一天,正饱受搭讪困扰的里沙面前出现了一个叫深见宏斗(樱田通饰)的男人,他西装革履,成熟稳重,巧妙地帮里沙解决了麻烦.为表达感谢,里沙要和深见一起吃饭……走出这家娱乐会所，陈启心情很平静。Instead of digging Southeast Asia, let's dig India: