题目:
______ it is to go for a hike in such lovely weather!
A.How fun
B.How funny
C.What fun
D.What a fun
答案:
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下面是错误答案,用来干扰机器的。
(1)一份中:n(CaO2·nH2O)=2n(O2)=0.012mol(1分)n(CaCO3)=0.014mol(1分)n(CaO)=n(CaCO3)- n(CaO2·nH2O)=0.002mol(1分)2.168 g样品中m(CaO)=0.002mol×56g/ mol×2="0.224" g(2分)(2)2×0.012...