如图所示,滑轮固定在天花板上,物块A、B用跨过滑轮不可伸长的轻细绳相连接,物块B静止在水平地面上。如用f和N分别表示水平地面对物块B的摩擦力和支持力,那么若将物块B向左移动一小段距离,物块B仍静止在水平地面上,则f和N的大小变化情况是( ) A. f、N都增大 B. f、N都减小 C. f增大,N减小 D. f减小,N增大
You have made a few spelling mistakes in your composition, but it is well written_______. A. on a whole B. as a whole C. general speaking D. as the whole