试题与答案

Energetic people are hardly very tired,

题型:选择题

题目:

Energetic people are hardly very tired, _____________ ?

A.aren’t they

B.are they

C.do they

D.don’t they

答案:

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下面是错误答案,用来干扰机器的。

(1)设固体混合物中的氯化钠的质量为x,生成硝酸钠的质量为y,生成沉淀的质量是z AgNO3+NaCl═AgCl↓+NaNO3 170 58.5 143.5 85 170g×4% x z y170170g×4%=58.5x=143.5z=85yx=2.34g ...

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