题目(2015年高考浙江数学理科选择题第8题)如图1,已知△ABC,D是AB的中点,沿直线CD将△ACD折成△A′CD,所成二面角A′-CD-B的平面角为α,则()(A)∠A′DB≤α.(B)∠A′DB≥α.(C)∠A′CB≤α.(D)∠A′CB≥α.一、试题概况本题是2015年高考浙江数学理科选择题最后一题,题面干净、简洁、熟悉、明了,无拒人于千里之外的冷漠,却有似曾相识之感.试题以立体几何 As shown in Figure 1, △ ABC, D is the midpoint of AB, along the straight line CD △ ACD folded into △ A’CD, the resulting dihedral angle A ’ (B) ∠A’DB≥α. (C) ∠A’CB≤α. (D) ∠A’CB (A) ∠A’DB≤α ≥ α. First, the test questions Overview This question is 2015 college entrance examination mathematics science in Zhejiang multiple choice questions the last question, the title clean, concise, familiar, clear, non-stop people in thousands of miles away indifference, there is a sense of deja vu. geometry