单项选择题

若一个高斯面内电荷的代数和为零，下列哪个说法正确？（）

A.穿过整个高斯面的电通量为零。
B.穿过高斯面上每个面元的电通量为零。
C.高斯面内没有电荷。
D.高斯面上各点的电场强度为零。

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多项选择题

我国古代历史文献中记载的游牧民族有哪些？

A．匈奴
B．突厥
C．蒙古
D．越人

单项选择题

Which one of the following statements is true

A．The plaque that has caused the problem is not removed during angioplasty
B．The risk of dying during an angioplasty procedure is 3–5%
C．The coronary balloon angioplasty is a separate procedure from inflating a balloon into a blocked artery
D．All of the above statements are true