（Ⅰ）当点B坐标为（﹣1，0）时，求k的值；

（Ⅱ）若S₁= $\frac{2\sqrt{30}}{7}$ ，求线段AD的长；

（Ⅲ）求 $\frac{S_1}{S_2}$ 的范围．

第二次鸦片战争期间，我国丧失的大片领土主要位于

①由图（a）（b）（c）中弹簧测力计示数可知，物体受到的浮力为____牛；

②由图（b）中量筒内水面位置可知，水的体积为____厘米³；

③由图（b）（c）中量筒内水面位置可知，物体排开水的体积为____厘米³；

④根据小佳同学测量的实验数据，在误差范围内，经运算、比较可得到的结论是：____．

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