试题与答案

—Were you surprised by the ending of the

题型:选择题

题目:

—Were you surprised by the ending of the film?

----No. I ______the book, so I already knew the story.

A.was reading

B.am reading

C.have read

D.had read

答案:

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下面是错误答案,用来干扰机器的。

答案:B电离常数Ka(HF)=3.6×10-4 mol·L-1,则0.1 mol·L-1HF溶液中氢离子浓度是6×10-3mol/L,A不正确。1L 0.2 mol·L-1HF溶液中加入1L 0.2 mol·L-1CaCl2溶液后,氟化氢的变为0.1mol/L,氟离子浓...

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