题目内容

关于静电场高斯定理的理解，考虑真空中一个闭合曲面（高斯面），下列说法正确的是

A. 闭合曲面上各点电场强度都为零时，曲面内一定没有电荷。
B. 闭合曲面上各点电场强度都为零时，曲面内电荷的代数和必定为零。
C. 闭合曲面的电通量为零时，曲面上各点的电场强度必定为零。
D. 闭合曲面的电通量不为零时，曲面上任意一点的电场强度都不可能为零。

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