一个人在竖直的平面镜前以4.5m/s的速度离开平面镜,则他的像对人的速度为___ 发布时间:2017-05-15 23:41 │ 来源:www.tikuol.com 题型:填空题 问题: 一个人在竖直的平面镜前以4.5m/s的速度离开平面镜,则他的像对人的速度为______m/s,像的大小将______.(选填变大、不变、变小)
题型:填空题 —Zhou Weilun could hardly speak English three years ago, ________?—No, he couldn't. But now he is quite good at it.[ ]A. couldn't heB. could heC. didn't heD. did he 查看答案