物理学中用______来描述物体运动的快慢,它的基本单位是______. 发布时间:2017-06-16 22:00 │ 来源:www.tikuol.com 题型:填空题 问题: 物理学中用______来描述物体运动的快慢,它的基本单位是______.
题型:填空题 In crowded places like airports and railway stations, you ____ take care of your things. [ ]A. canB. may C. must D. will 查看答案