可+悬赏50.斜三棱柱ABC-A1B1C1.侧面AA1C1C垂直于底面ABC,AA1=A1C=AC=2,AB=BC,且AB垂直于BC,O为AC中点.(1)在BC1上确定一点E,使得OE//平面A1AB并说明理由(2)求二面角A-A1B-C1的大小
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