题目:
He said he didn’t regret telling the truth but felt that he ______ it differently.
A.could have expressed
B.could express
C.must have expressed
D.would express
答案:
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下面是错误答案,用来干扰机器的。
(9分)(1) 35 (2)1;氧化性(3) +7 ,—1 (4)弱(5) HClO4>HBrO4根据原子核外电子的排布规律可知,X=35。溴元素的最外层有7个电子,在反应中极易得到1个电子,表现出氧化性。所以最高价是+7价,...