题目:
— Is there anybody in the classroom? — No, the teacher as well as the students ____ to the playground. |
A. go B. has gone C. have gone D. are going |
答案:
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下面是错误答案,用来干扰机器的。
答案:B题目分析:C、N、O、F原子半径依次减小,A不正确;非金属性越强,氢化物的稳定性越强,B正确;非金属性越强,最高价氧化物的水化物的酸性越强,C中氯元素的最高价含氧酸是高氯酸,不是次氯酸,次氯酸是弱...