39.如图23所示杠杆ab放在钢制圆柱体的正中央水平凹槽cd中杠杆ab能以凹槽两端的c点或d点为支点在竖直平面内转动 Cd=02m细 Template




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tomski39.如图23所示杠杆ab放在钢制圆柱体的正中央水平凹槽cd中杠杆ab能以凹槽两端的c点或d点为支点在竖直平面内转动 cd=02m细 coloring