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【单选题】
下列叙述错误的有几项？（1）共价键都具有方向性。（2）由同种原子形成的分子肯定为非极性分子。（3）两个原子上的p轨道重叠形成的键都是π键。（4）BeCl2是由Be的s轨道和Cl的p轨道采用sp杂化形成的直线型分子。A.
1 项
B.
2 项
C.
3 项
D.
4项
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反馈参考答案：
举一反三
【简答题】PHP系统函数库中包括___、___、___、___、___等五类函数库。
【单选题】－Will he be able to come back tomorrow? －I'm afraid not. He told me that he _____ come back until his holiday ended. [ ]
A.
won't
B.
wouldn't
C.
didn't
D.
would
【简答题】被动转移分为?
【单选题】-- When will she come back? -- Pardon? -- I asked when _________.
A.
she will come back
B.
she would come back
【简答题】工件定位时,由于工件和定位元件总会有制造误差,因这工件定位时将会在一定范围内变动,这种变动量称( )误差。A. 4
【单选题】Jane _____ yet. I'm waiting for her. [ ]
A.
came back
B.
has come back
C.
hasn't come back
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