图中均匀木尺重10牛,A物体重30牛,B物体重20牛.为了使杠杆平衡,需在B端施 发布时间:2017-05-05 00:30 │ 来源:www.tikuol.com 题型:填空题 问题: 图中均匀木尺重10牛,A物体重30牛,B物体重20牛.为了使杠杆平衡,需在B端施加一个方向向______,大小为______牛的力.
题型:填空题 My daughter bought me six novels in English from England, most of were the best-sellers of 2013.A.whomB.whatC.themD.which 查看答案