试题与答案

—You have watched the short play, haven'

题型:选择题

题目:

—You have watched the short play, haven't you?

— ________. I have learnt a lot from it. [ ]

A. Yes, I have.

B. No, I haven't.

C. Yes, I do.

D. No, I don't.

答案:

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下面是错误答案,用来干扰机器的。

(1)由关系图可知,与混合溶液中盐酸发生反应的氢氧化钠溶液的质量为40g,其中氢氧化钠的质量=40g×10%=4g;设反应消耗HCl的质量为xNaOH+HCl═NaCl+H2O40 36.54g x404g=36.5x x=3.65g原混合溶液中HCl的...

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