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【单选题】
离中趋势指标中,最容易受极端值影响的是A.
极差
B.
平均差
C.
标准差
D.
标准差系数
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皮皮学刷刷变学霸
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【多选题】下列关于杂化轨道的叙述中，正确的是 [ ]
A.
分子中的中心原子通过sp 3 杂化轨道成键时，该分子一定为正四面体结构
B.
CCl 4 分子中有四个完全等同的sp 3 -pσ键
C.
杂化轨道一般只用于形成σ键或用于容纳未参与成键的孤对电子
D.
杂化轨道理论与VSEPR模型分析分子的空间构型结果常常相互矛盾
【简答题】完形填空。 I never knew how well Mother could keep a trust until I was going through her things after she died. I discovered something I had 1 forgotten, something that happened to as a child. One night, a...
【简答题】Like many new graduates, I left university full of hope for the future but with no real idea of what I wanted to do. My degree, with honors, in English literature had not really prepared me for anythi...
【多选题】关于共价键的正确叙述是（多选）
A.
σ 键一般较 π 键强
B.
用杂化轨道重叠成键将有利于提高键能
C.
金属与非金属元素原子间不会形成共价键
D.
共价键具有方向性，容易破坏
【简答题】简述JDBC的工作任务。
【简答题】(2016新课标III) The age year from 13 to 19 were the most difficult time for me . They were also the best and worse years in my life . At the first, I thought I knew everything and could make decision...
【单选题】_____I knew how to operate an electronic computer as you do I could find a job.
A.
If only
B.
Only if
C.
What if
D.
Since then
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