Ab两物体质量之比为21以绳相连并在�上的恒力f作用下运动若将ab位置对调后仍用原来力使它们运动.前后两次运动中绳中张力之比是1 Template




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tomskiab两物体质量之比为21以绳相连并在�上的恒力f作用下运动若将ab位置对调后仍用原来力使它们运动.前后两次运动中绳中张力之比是1 coloring