人教版新目标八下英语 Section B 3a（P30） 翻译

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• 如图，四棱锥P-ABCD中，PA⊥平面ABCD，PA=AB，底面ABCD为直角梯形，∠ABC=∠BAD=90°，PA=BC=12AD．（1）求证：平面PAC⊥平面PCD；（2）在棱PD上是否存在一点E，使CE∥平面PAB？若存在，请确定E点的位置；若不存在，请说明理由．
• 在四棱锥P-ABCD中,已知PA垂直于地面ABCD,且底面ABCD为矩形,则下列结论中错误的为：平面ABC垂直于平面PCD为什么?还有棱垂直于交线是怎样的?