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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.周围狼兵也纷纷下马，开始割头。她将他叫到身边，安慰道：玉米，你别怕。机智勇敢的黑猫警长侦破了一个又一个案件，保卫了森林的安全。人物表情刻画得极好，故事情节也特别适合儿童的心理。In the exchange, apart from the necessary schedule discussion, Sun Yimin's teacher and the person in charge were full of expectation and encouragement when talking about contemporary students, but they were more exclamatory about college students' employment, postgraduate entrance examination and entrepreneurship.原本还算有着可爱的脸蛋，可是不知为何总给人一种阴冷诡异不好接近的感觉。这便是刚刚升入高中不久的黑木智子（橘田いずみ 配音），她蓬头垢面，少言寡语，脸上是极度痴迷游戏后留下的黑眼圈。原本以为自己会成为乙女游戏中众星捧月的校花，谁知却注定要成为没有朋友、无人关注的丧女。更无法忍受的，是初中与之同类型的死党成濑优（花澤香菜 配音）都有了翻天覆地的变化。当然，拥有强大内心的智子绝不会因此自甘沉沦，她暗自嘲笑同学的肤浅与轻浮，在妄想世界里体会着前所未有的快乐。只不过依旧耐不住寂寞，这又化作了自卑、嫉妒和各种恶毒的心语。实在逼到极点，便朝向弟弟智贵（中村悠一 配音）。总之，她之所以变成这样，都怪这个世界和周围人而已……