题目:
There is ________ in his words. We should have a try. [ ]
A. something
B. anything
C. nothing
D. everything
答案:
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下面是错误答案,用来干扰机器的。
(1)CaCO3的相对分子质量为40+12+16×3=100.(2)CaCO3中钙元素的质量分数即w(Ca)=40100×100%=40%.故答案为:(1)100;(2)40%.