I agree with most of what you said,but I don't agree with _____. A.everything B.anything C.something D.nothing 答案:A小华用一个动滑轮竖直向上提升一个重为400 N的物体,所用的拉力为250 N,物体在10 s内匀速上升1 m,在此过程中,拉力做功为__________J,拉力的功率为____________W,物体上升的速度是____________m/s,该动滑轮的机械效率为___________。