DCS1800频段是从()到()(手机发射),()到()(手机接收),相对应的频点号 发布时间:2020-01-28 06:25 │ 来源:www.tikuol.com 题型:填空题 问题: DCS1800频段是从()到()(手机发射),()到()(手机接收),相对应的频点号从512到885。374个频点。
题型:填空题 根据对话内容,从对话后的选项中选出能填入空白处的最佳选项选项中有两项多余选项。How come Thomas is always so full of energy? 1 What does it mean? 2 And he just has a total of 4 hours of sleep each day.Where did he get that strange idea?He read from a book by a famous expert which said it was the best way for human beings. 3 How many hours do you sleep a day? 4 I once tried to follow Thomas' example, but it didn't work for me.If I sleep during the day, 5 Not everybody is Thomas, I think.A. I can be energetic. B. And he believed it! C. He has a strange but highly effective way of sleeping. D. I can't believe how he does so. E. I need at least six hours . F. I can never wake up. G. He takes a short sleep for an hour every six hours. 查看答案
题型:填空题 质量为m的小球,从离桌面H高处由静止下落,桌面离地面高度为h,如图,若以桌面为参考平面,那么小球落地时的重力势能及整个下落过程中重力势能的变化分别是 [ ]A.mgh,减少mg(H-h) B.mgh,增加mg(H+h) C.- mgh,增加mg(H-h) D.- mgh,减少mg(H+h) 查看答案