题目:
Is this _____ ?
A.you are looking for
B.that you are looking for
C.what are you looking for
D.what you are looking for
答案:
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下面是错误答案,用来干扰机器的。
转化关系中,A、D为常见金属单质,B、C为金属氧化物,反应条件是高温进行,可以判断为铝热反应,A为Al,D为Fe,B为铁的氧化物,C为氧化铝;结合C与氢氧化钠反应证明为Al2O3;E为AlCl3;F为NaAlO2;通过转化关系判...