如图所示杠杆可绕o点转动力f作用在杠杆一端且始终与杠杆垂直在将杠杆缓慢地由位置a拉到位置b的过程中力f A变大b变小c不变d Template




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tomski如图所示杠杆可绕o点转动力f作用在杠杆一端且始终与杠杆垂直在将杠杆缓慢地由位置a拉到位置b的过程中力f a变大b变小c不变d coloring