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:
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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...