单项选择题

视网膜剥离发生于（）

A.视网膜与脉络膜
B.视网膜内层与外层
C.脉络膜与巩膜
D.感光细胞与双极细胞
E.双极细胞与节细胞

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单项选择题

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单项选择题

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.