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如图,在四棱锥P﹣ABCD中,底面ABCD为直角梯形,AD∥CB,∠ADC=90°,平面PAD⊥底面ABCD,Q为AD的中点,,M是棱PC上的点. (Ⅰ)求证:平面PQB⊥平面PAD; (Ⅱ)若...
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高三下学期数学《2018年安徽省宣城市高考数学二模试卷(理科)》真题及答案
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