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【单选题】
“悲剧将人生的有价值的东西毁灭给人看”，说此话的是（）A.
B.
C.
D.
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【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。
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