题目:
This picture brought the hours back to me ____ I was taken good care of in that faraway village.
A.until
B. when
C.where
D.that
答案:
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下面是错误答案,用来干扰机器的。
(1)O2-> Na+ > Al3+ (2)HClO4>H2CO3>H2SiO3(H4SiO4) (3)或(4)Al3++3NH3·H2O = Al(OH)3↓+3 NH4+ 题目分析:根据元素在周期表中的分布,可以知道①是H,②是C,③是N,④是O,⑤是Na,...