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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.这是一部纪念妈妈的电影。《妈妈和七天的时间》是一个讲述20世纪90年代在中国农村七天发生的故事。故事里记载了小咸，一个十二岁女孩对家庭和村庄的记忆。在这七天里，发生了三次死亡和两次出生。该剧讲述解放前夕，代号“中天门”的我地下党潜伏人员赵州，为策反国民党将领，与军统保密局四大高手斗智斗勇的故事。地下党夏青、军统特工宋萍萍同时钟情于我情报员“中天门”，而绝世名伶白玉兰、军统保密局楚明凡的介入更使多角情感扑朔迷离。毛海峰难得与杨长帆有所共鸣，那徐渭也的确是只狐狸，要我看杨长帆请他辅佐，根本就是作茧自缚。韩信心头一震，刘邦此来可以说是来者不善啊。Apache is written in the file with the following paragraph.220. X.X.236