题型:选择题 — Do you know who designed the CD-ROM Around the World in Enight Hours? — Yes, It ______ by Nancy Jackson. [ ]A. has designed B. designedC. was designed D. designs 查看答案
题型:单项选择题 汽车在平直公路上以速度v0做匀速直线运动。当它路过某处的同时,该处有一辆汽车乙开始做初速度为零的匀加速运动去追赶甲车.根据上述的已知多件()A.可求出乙车追上甲车时的速度B.可求出乙车追上甲车时所走的路程C.可求出乙车从开始运动到追上甲车所用的时间D.不能求出上述三者中的任何一个 查看答案