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在如图所示的多面体中,EA⊥平面ABC,DB⊥平面ABC,AC⊥BC,且AC=BC=BD=2AE=2,M是AB的中点. (Ⅰ)求证:CM⊥EM; (Ⅱ)求平面EMC与平面BCD所成的锐二面角的余...
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高二上学期数学《2017-2018学年贵州省遵义市习水县高二(上)期末数学试卷(理科)》真题及答案
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