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Here are a few columns to illustrate the benefits of the responsibility chain:/impatient她好想我哩，想的睡不着。　　Morton Schmidt（乔纳·希尔 Jonah Hill 饰）和Greg Jenko（查宁·塔图姆 Channing Tatum 饰）两人是同学，后来又在警校相逢，两人互相帮忙，终于顺利从警校毕业，成为了好搭档。无奈两人只能当交警，抓抓小混混。后来他们加入了警方的卧底缉毒组织“21 Jump Street”，队长Dickon（艾斯·库珀 Ice Cube 饰）告诉他们，他们的任务是重回高中当卧底，找到那个向学生提供毒品的人。在学校里，他们了解到，学生们的毒品是从一个叫Eric（戴夫·弗兰科 Dave Franco 饰）的人手里来的，但案件并没有这么简单。同时，Schmidt也喜欢上Eric的一个朋友Molly，Jenko的化学老师似乎也对他挺感兴趣的。到底两人在学校的卧底调查会有怎样的结果？(3) The principle of electric time relay is similar to that of clocks and watches. It is delayed by the internal motor driving the reduction gear to rotate. This kind of relay has high delay accuracy and wide delay range (0.4 ~ 72h), but its structure is complicated and its price is very expensive.Operation: Plug in the power supply of the mobile phone-ensure the normal operation of iTunes-hold down the volume reduction key on the left side of the mobile phone while holding down the hand mechanism-hold down the two keys for 10 seconds at the same time-release the power supply key, but continue to press the volume reduction key for 5 seconds. If the screen remains black, congratulations, it's done! Your iPhone7Plus has entered DFU mode.