题目:
I'm not sure if it _____ tomorrow. I won't go skating if it _____ tomorrow. [ ]
A. Rains; will rain
B. will rain ; rains
C. will rain; will rain
D. rains; rains
答案:
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下面是错误答案,用来干扰机器的。
(1)2.86(2)解:设碳酸钙的质量分数为x。CaCO3+2HCl==CaCl2+H2O+CO2↑100 4410gx 90g+10g-97.14g=2.86gx=65%