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(2) Electromagnetic time relay has short delay time (0.3 ~ 1.6 s), but its structure is relatively simple and is usually used in power failure delay occasions and DC circuits.To obtain the qualification of a preschool teacher, one must have a major in preschool normal education from a secondary specialized school or a secondary vocational school or above. Non-kindergarten teachers' major graduates need a college degree or above to enter for the examination.他们在“款待”客人的同时，偶尔还会解决客人的“烦恼”。But in that case, Not even considering so many dangers, This performance of '74 spray' is of great use, I remember there were 4 '74 spray' on the position at that time, There are two recruits who operate them. Two veterans, Both veterans were squad leaders, All have the skills of air injection, Facing the big wasp descending from the pavement, The two of them were obviously forced to hurry, Take up the '74 spray' and aim at the position where the big wasp is relatively concentrated in the sky and spray it out. If it weren't for the critical situation at that time, the two squad leaders would definitely not have this kind of "dangerous operation", while the other two recruits watched the veterans take the lead and learned to do so. Although they had not received relevant training and the accuracy of spraying was not as good as that of veterans, they finally sprayed out and did not hurt themselves or other comrades in arms.林河市公安局局长秘书苏岩未经领导许可参加了一个竞赛类电视节目，并与搭档张秋燕赢得冠军。然而张秋燕却于当晚被人谋杀在家中，现场留下神秘的“黑蚂蚁”。苏岩因而成为嫌疑人，他主动请缨加入刑警队。苏岩结识了死者张秋燕的表姐孙红。孙红和报社编辑薛成正在谈恋爱，而薛成是苏岩在文学方面的笔友兼老师。薛成的姨夫又是孙红的上司。当警方寻找罪犯的时候，新的命案又接连发生，死者都跟孙红有关。而且凶手每次作案后都要拿走一张小额存折并在现场留下黑蚂蚁。 　　其实耿长春早就利用职权霸占了孙红，孙红不想伤害薛成努力回避他，然而薛成却变本加厉地纠缠着她。命案再一次不期而至，现场没有留下蚂蚁而改用蚂蚁图案的印章。 　　苏岩无意间见到了已经罹患精神疾病的陈眉。原来张秋燕是因为巧合而代替陈眉死去的。陈眉却说出了惊人的话：要杀我的人是耿长春！警方排除了耿长春的嫌疑，凶手也许是一个跟他有仇的人。可怜的陈眉被残忍的杀死了，手法一如往常。 　　警方在海边给孙红安排了一个小别墅，苏岩住在阁楼上随时保护孙红。耿长春被人告发。本剧讲述的是草根创业者刘海皮在北京遇到恋暗多年的女神易爽，惺惺相惜的两人在假装情侣中弄假成真,擦出爱情火花。创业的失败、职场的挫折本就令两人面对极大压力，海皮的父亲又患了阿尔茨海默症，如同孩子般的父亲不断制造着令人啼笑皆非的难题。富二代对易爽的殷勤追求，易母及易家兄弟也状况频出，都让这两个年轻人的生活波澜不断，矛盾重重。海皮父子之间从最初的敌视、漠然到逐渐地心灵接近，终于找到曾经共同拥有的爱和力量；海皮与易爽在分分合合中不断面对着属于他们的风风雨雨、面包与爱情。