题目

下面关于加速度的描述中正确的是 A. 加速度描述了物体速度变化的多少B. 匀速行驶的磁悬浮列车，由于其速度很大，所以加速度很大C. 物体的速度变化越快，则加速度越大D. 列车加速度逐渐减小时，一定在做减速运动 答案：【答案】C【解析】加速度是反映速度变化快慢的物理量，故A错误；匀速行驶的磁悬浮列车，速度很大，加速度为零，故B错误；加速度是反映速度变化快慢的物理量，速度变化越快，加速度越大，故C正确；当加速度的方向与速度方向相同，加速度减小，速度增大，故D错误。Which of the following sentence is not correct? [　　] A．He broke his leg while playing football. B．His leg was broken while playing football. C．He got his leg broken when he was playing football . D．His leg got broken when he was playing football.