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下列级数哪个是条件收敛（

A．

B．

C．

D．

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Four point charges Q1, Q2 , Q3 , Q4 are in space. S is a closed surface. E is the magnitude of the electric field at an arbitrary point on surface S and denotes the electric flux through S. If the charge Q1 is moved from point a to point b along the dashed line, which of the following statements is true? A、Both E and FE change. B、Both E and FE do not change. C、E changes but FE does not change. D、E does not change but FE changes.

单项选择题

题4-1-7、下图中的为（）。

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