$$ 2)点电荷不位于球面的中心的电通量是? A \\phi \_\_\__{e}=0\ \ E B \\Phi \_\_\__{e}= \\frac {q}{e\_\_\__{0}}\ \ C \\Phi \_\_\__{e}=- \\frac {q}{e\_\_\__{0}}\ \ D 无法确定 $$
_(P)gt (E)_(Q) b. _(P)lt (E)_(Q) c. _(P)=(E)_(Q)
U=0 (B) E=0 , =dfrac (9)(2pi {varepsilon )_(0)a} q q-|||-(C) =dfrac (q)(2pi {var
U=0-|||-(B) E=0 . =dfrac (q)(2pi {varepsilon )_(0)a}-|||-(C) =dfrac (q)(2pi {var
Phi (x)=Phi (-x) C. Phi (x)=-Phi (-x) B. Phi (-x)=1-Phi (x)-|||-,0leqslant xleqs
积分上限函数Phi(x)=int_(a)^e^(x)(ln t)/(t)dt,则Phi^prime(x)的值为().A. -xB. xC. $-\frac{x}
已知 n 阶矩阵A满足,(A)^2+3A-5E=0,则(A)^2+3A-5E=0( ) A (A)^2+3A-5E=0 B (A)^2+3A-5E=0 C (A
设A为三阶矩阵,且|A+E|=0,|A+2E|=0,|A+3E|=0,|A+4E|=()A -2;B 6;C 4.D -4;单选题(共20题,100.0分)14
()-|||-A (X)=0, E(Y)=2-|||-B (x)=2, E(Y)=0-|||-C (X)=3, E(Y)=1-|||-D (x)=1 E(Y)=
设A是3阶矩阵,已知|A+E|=0,|A+2E|=0,|A+3E|=0,则|A+4E|= ________ .设A是3阶矩阵,已知|A+E|=0,|A+2E|