| 如图所示，边长为L的正方形线圈abcd 其匝数为n总电阻为r外电路的 电阻为R，ab的中点和cd的中点的连线OO′恰好位于匀强磁场的边界线上，磁场的磁感应强度为B，若线圈从图示位置开始，以角速度ω绕OO′轴匀速转动，则以下判断中正确的是（ ） A．闭合电路中感应电动势的瞬时表达式e=nBL2ωsinωt B．在t= C．从t=0 时刻到t= D．从t=0 时刻到t=  |
BCD
● 小题1: Home can be a great place for children to study. It’s important to provide a workspace of their own where they can read books or just write a letter to their friends。 ●Location(位置) 小题2: Kitchen and dining room are not so well suited for regular study, since books and pens get in the way of the day-to-day uses of those areas. Set up a place where a child can settle in and leave papers and pens at band without having to clear everything away each night. For a child that likes being alone, set aside a corner of his bedroom, but keep it separate from things like games, music and other hobbies not related to studying。 ●Keeping Things in Order Parents should encourage their child to spread out, but to leave it neat and orderly when he isn’t using his workspace. Ownership is very important for self-respect 小题3: . The workplace should be personal, but not another part of the playroom。 ● 小题4: Encourage the whole family to help build a supportive environment that children need for success in school. Give them a good example of how to deal with problems, how to manage time and get things done in the right way. ● 小题5: Study will be more enjoyable and effective when supported by the whole family。
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