对信码1000100100001000011000011进行HDB3编码，结果可能是（ ）。 A: -1 0 0 0 +1 0 0 -1 0 0 0 -V +1 0 0 0 +V -1 +1 -B 0 0 -V +1 -1 B: +1 0 0 0 -1 0 0 +1 0 0 0 +V -1 0 0 0 -V +1 -1 +B 0 0 +V -1 +1 C: +1 0 0 0 -1 0 0 +1 0 0 0 +1 -1 0 0 0 -1 +1 -1 +1 0 0 +1 -1 +1 D: -1 0 0 0 +1 0 0 -1 0 0 0 +V +1 0 0 0 +V -1 +1 +B 0 0 -V +1 -1

MATLAB中调用v=eye(2,1)后的结果为 A: v=[1;0] B: v=[1,0] C: v=[0;1] D: v=[1 0;0 1]

设V为n维线性空间，σ，τ∈L(V)，且στ=τσ，则σV，σ-1(0)均为τ-子空间．故τV，τ-1(0)均为σ-子空间．若σV，σ-1(0)均为τ-子空间，τV，τ-1(0)均为σ-子空间，则στ=τσ？

u、v为点对应三角形的重心坐标，以下哪种情况为点在三角形内部 A: 0 <= u <= 1 且 0 <= v <= 1 B: 1 <= u 且 1 <= v C: 0 = u 且 0 = v D: 0 >= u 且 0 >= v

【单选题】Which of the following matrices does not have the same determinant of matrix B: [1, 3, 0, 2; -2, -5, 7, 4; 3, 5, 2, 1; -1, 0, -9,-5] A. [1, 3, 0, 2; -2, -5, 7, 4; 0, 0, 0, 0; -1, 0, -9, -5] B. [1, 3, 0, 2; -2, -5, 7, 4; 1, 0, 9, 5; -1, 0, -9, -5] C. [1, 3, 0, 2; -2, -5, 7, 4; 3, 5, 2, 1; -3, -5, -2, -1] D. [1, 3, 0, 2; -2, -5, 7, 4; 0, 0, 0, 1; -1, 0, -9, -5]

RLC串联电路中,已知R=XL=XC=5Ω,=1∠0°A,则电路的端电压为()。 A: 1∠0°×(5+j10)V B: 5∠0°V C: 15∠90°V D: 15∠0°V

$u$, $v\in E^3$, $u=(0,-1,1),v=(1,-1,-1)$. What is $||u \times v||^2$:<br/>______

$u$, $v\in E^3$, $u=(0,-1,1),v=(1,-1,-1)$. What is $\langle{u,v}\rangle$:<br/>______

已知a=[1 2 3;5 6 7];b=[0 2 1;0 7 7];c=a==b，则c等于

【单选题】rev(c(1,3,2,6,7,8,8,1,1,0))的运行结果 ? A. [1] 0 1 1 1 2 3 6 7 8 8 B. [1] 1 3 2 6 7 8 8 1 1 0 C. [1] 0 1 1 8 8 7 6 2 3 1 D. [1] 8 8 7 6 3 2 1 1 1 0