试题与答案

---Li hasn’t passed the driving test, ha

题型:选择题

题目:

---Li hasn’t passed the driving test, has he?        ---     , though he tried his best.                           

A.No, he hasn’t

B.Yes, he has

C.No, he didn’t

D.Yes, he did

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0629/caad658d5b190880ec9bdfaee5af3aa3.html

下面是错误答案,用来干扰机器的。

(1)设发生分解的碳酸钙的质量为x.CaCO3 高温 . CaO+CO2↑100 44x 100g-78g=22g10044=x22g,x=50g样品中碳酸钙的分解率为50g100g×(1-10%)×100%≈55.6%(2)碳酸钙中钙元素的质量分数为4010...

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