如图所示四个完全相同的轻弹簧都�竖直它们的上端受到大小都为f的拉力作用而下端的情况各不相同.a中弹簧下端固定在地面上b中弹簧下端受大小 Template




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tomski如图所示四个完全相同的轻弹簧都�竖直它们的上端受到大小都为f的拉力作用而下端的情况各不相同.a中弹簧下端固定在地面上b中弹簧下端受大小 coloring