单项选择题


A、uI
B、-uI
C、2uI
D、-2uI

<上一题 目录 下一题>
热门 试题

单项选择题
下列级数哪个是条件收敛（
A．
B．
C．
D．
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.
相关试题