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【简答题】
两个相同的电偶极子组成一个电四极子，如图14-2所示。 两个电偶极子在同一直线上且负电荷重合，它们的电偶极距p=ql，但方向相反。试证其延长线上距中心为r处的电场强度大小为 式中的Q=2ql2称为电四极子的电四极矩。
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【简答题】A __________statement is a general term for a personalized financial record that regularly informs a recipient about the status of his or her account. It is generally mailed to the recipient on or nea...
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【单选题】Arbitrage______.
A.
is a general economic term for buying something where it is cheap and selling it where it is dear
B.
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C.
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D.
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E.
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