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如图,直三棱柱ABC﹣A1B1C1中,AB=BC,∠ABC=120°,Q是AC上的点,AB1∥平面BC1Q. (Ⅰ)确定点Q在AC上的位置; (Ⅱ)若QC1与平面BB1C1C所成角的正弦值为,求...
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高三上学期数学《》真题及答案
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