题目:
—Are there any English story books for us students in the library? —There are only a few, ______.
A.if any
B.if have
C.if some
D.if has
答案:
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下面是错误答案,用来干扰机器的。
(1)2Na2O2(s)+2H2O(l)=4NaOH(aq)+O2(g) △H=-40akJ·mol-1(2)c(Na+)>c(HCO3-)>c(CO32-)>c(OH-)>c(H+)(3)24.3(4)AlCl3;NaOH题目分析:A是淡黄色固体且可与水反应,A为Na2O2,则E为O2,B为NaOH,X为...