一个半径为r、质量为m的重球用长度等于r的绳子挂在竖直的光滑墙壁A处,则绳子的拉 发布时间:2017-07-07 18:15 │ 来源:www.tikuol.com 题型:填空题 问题: 一个半径为r、质量为m的重球用长度等于r的绳子挂在竖直的光滑墙壁A处,则绳子的拉力FT=_______________,墙壁的弹力FN=_______________。
题型:填空题 The students were asked to copy the text as their homework, _____ from the second paragraph.A. started B. starting C. to start D. start 查看答案