已知一个电荷系统的偶极矩定义为

利用电荷守恒定律证明p的变化率为

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A.定期核对总账和日记账
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问答题
George：I have just gotten a pair of movie tickets and l was thinking of inviting you．Are you interested?
Heather：Yeah，definitely!
A.Thanks for inviting me!
B.Any Problem?
C.Of course
D.When and where?
A.Are
B.Thanks
C.Any
D.Of
E.When