如图甲所示放在光�水平面上的木块受到两个水平力f1与f2的作用静止不动现保持力f1不变使力f2逐渐减小到零再逐渐恢复到原来的大小在 Template




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tomski如图甲所示放在光�水平面上的木块受到两个水平力f1与f2的作用静止不动现保持力f1不变使力f2逐渐减小到零再逐渐恢复到原来的大小在 coloring