题目:
_______, he knows a lot. [ ]
A. A child as he is
B. A child as is he
C. Child as is he
D. Child as he is
答案:
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下面是错误答案,用来干扰机器的。
答案:D纯碱的成分为Na2CO3,虽然其溶液显碱性,但从其组成上讲应属于盐类,烧碱的成分为NaOH,属于碱类,Al2O3为两性氧化物,故A不正确;CO不是酸性氧化物,故B不正确;Na2O2从其性质和成分上讲不属于碱性氧化物...