甲、乙两列火车,车长分别为L1和L2,在相邻的两条轨道上,甲车以速度v1向东匀速 发布时间:2017-06-17 10:54 │ 来源:www.tikuol.com 题型:填空题 问题: 甲、乙两列火车,车长分别为L1和L2,在相邻的两条轨道上,甲车以速度v1向东匀速行驶,乙车以速度v2向西匀速行驶,则甲、乙两列火车从相遇到离开所需时间为______.
题型:填空题 用适当的介词填空。1. There are lots of apples _____ the tree.2. Thanks _____ the great photo _____ your family.3. Please call Mary _____ 235-0285.4. What's the Chinese _____ "flag"?5. I write _____ my pen. 查看答案