How many ____ are there on the table?[ ] 发布时间:2017-03-26 03:21 │ 来源:www.tikuol.com 题型:选择题 问题: How many ____ are there on the table?[ ]A. water B. cup of water C. bottles of water
题型:选择题 如图所示,重物A静止在水平地面上,某人用力F沿水平方向推A,但A静止不动.关于人对A的推力F,以下说法中正确的是( )A.F大于地面给A的静摩擦力B.F小于地面给A的静摩擦力C.F大小改变时,静摩擦力大小不改变D.F越大,静摩擦力越大,推力与静摩擦力平衡 查看答案