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(本题满分7分) 已知直线 ： 与 轴和 轴分别交于 两点，直线 经过点 且与直线 垂直，垂足为 ． （Ⅰ）求直线 的方程与点 的坐标； （Ⅱ）若将四边形 （ 为坐标原点）绕 轴旋转一得到一几何体，求该几何体的体积 ．
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