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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.近松门左卫门先生见如此叫座，马不停蹄又写下了《国姓爷后来的战斗》和《中国船带来的当今国姓爷的消息》两部续集，活生生的yy成了三部曲，其实这样很麻烦，不如直接命名为《超级大和武士郑成功之天皇无敌》更直白一些，一定能更加卖座。老张和儿女们居住在北京胡同中的一个小院里。在老伴过世三年后，老张与乐观善良的李桂香结了婚，可这位继母一踏进张家小院，就不得不面对张家儿女们出的一道道难题：大儿媳生活富裕，却总是担心李桂香来张家是为了争夺张家房产；二儿媳经历了丧夫丧子的痛楚，时至今日也不敢向往幸福的未来；小女儿张圆圆虽然单身，但倔强的性格使她无法与几位嫂子相处。Twenty-fifth fire technical service institutions and their employees shall, in accordance with laws and regulations, technical standards and practice standards, carry out the following social fire technical service activities, and be responsible for the quality of service:4珊瑚瘪嘴叫道，那是我爹。