如图细线a和b的一端分别固定在水平地面上另一端系一个静止在空气中的氢气球细线与地面的夹角分别为30°和60°.若ab受到的拉力分别为 Template




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tomski如图细线a和b的一端分别固定在水平地面上另一端系一个静止在空气中的氢气球细线与地面的夹角分别为30°和60°.若ab受到的拉力分别为 coloring