如图所示水平地面上的物体a在斜�上的拉力f作用下�右作匀速直线运动.现改变f的大小和f与水平的夹角θ但始终使物体做匀速运动.则下列说法 Template


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tomski如图所示水平地面上的物体a在斜�上的拉力f作用下�右作匀速直线运动.现改变f的大小和f与水平的夹角θ但始终使物体做匀速运动.则下列说法 coloring