I hope there are enough glasses for each 发布时间:2017-05-17 17:47 │ 来源:www.tikuol.com 题型:选择题 问题: I hope there are enough glasses for each guest to have ______.A.itB.thoseC.themD.one
题型:选择题 力是物体对物体的作用.一本书放在桌上,书对桌面有一个______力,______是施力物体,______是受力物体;同时桌面对书有一个______力,______是施力物体,______是受力物体,这说明物体间力的作用是相互的. 查看答案