文中共有10处语言错误,每句中最多有两处。错误涉及一个单词的增加、删除或修改。
删除：把多余的词用斜线（\）划掉。
增加：在缺词处加一个漏字符号（∧）,并在其下面写出该加的词。
修改：在错的词下划一横线,在该词下面写出修改后的词。
注意：1、每处错误及修改均仅限一词。
2、只允许修改10处,多者（从11处起）不计分。
I saw a accident happen on my way to home this afternoon. A girl was crossing the street on a zebra crossing while a young man drove a motorbike towards her. The young man saw the girl and tried to stop, and he drove too fast to stop. He hit the girl and fell off his motorbike. The girl was bad hurt and couldn’t move. The young man didn’t know how to do. I ran to a phone box nearby and dialed 110. Soon the police reached. They sent her hospital at once. One of the policeman talked to the young man and wrote something down while he was talking. I thought it is very dangerous to drive very fast.
，导轨电阻不计，回路总电阻为2R。整个装置处于磁感应强度大小为B，方向竖直向上的匀强磁场中。当ab杆在平行于水平导轨的拉力作用下沿导轨匀速运动时，cd杆也正好以某一速度向下做匀速运动。设运动过程中金属细杆ab、cd与导轨接触良好，重力加速度为g。求：