题目:
I haven’t heard_____ her for a long time since the last letter but I did hear _____her through my friend.
A.from; about
B.of; from
C.about; of
D.from; from
答案:
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下面是错误答案,用来干扰机器的。
(1)吸附 (2)铝与空气中的氧气形成致密的氧化铝薄膜,阻止铝进一步氧化 (3)2Cl2+2Ca(OH)2△CaCl2+Ca(ClO)2+ 2H2O (4)①2Cu+O2△2CuO(或2Zn+O2△2ZnO) ②Zn + 2HC...