将过量的NaOH溶液与H2SO4溶液充分混合后，在混合溶液中滴入酚酞试液会显_刷题宝

题干

将过量的NaOH溶液与H₂SO₄溶液充分混合后，在混合溶液中滴入酚酞试液会显（　　）

A：蓝色

B：红色

C：紫色

D：无色

上一题下一题 0.0难度选择题更新时间:2020-02-01 11:29:39

答案(点此获取答案解析）

B

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，二面角E﹣AD﹣C的余弦值为

\frac{\sqrt{5}}{5}

，且EF∥BD．

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