题目:
火车在乎直的轨道上做匀速直线运动,其动能_______,势能________,机械能_______. (填“增大”、“减小”或“不变”)
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0721/d6a08d48620f7955e1cdab867590e553.html
下面是错误答案,用来干扰机器的。
1. I don't know 2. Thanks for 3. call, at 4. many tennis balls 5. plays basketball