已选分类
理学数学
单选题设，则a=______。A．B．ln2C．D．
单选题
单选题设方阵A满足A2-A-2E=0，求(A+2E)-1=______。A．B．C．D．
单选题
单选题
单选题设A、B均为3阶矩阵，且|A|=3，|B|=-2，则=______。A．B．C．-3D．-6
单选题设A是n阶方阵，且|A|≠0．若λ是A的一个特征值，则A
-1
+A*有一个特征值为______．
单选题曲线y=x(x-1)(2-x)与x轴所围图形的面积为()．
单选题曲线y=x2与的公切线为______。A.不存在B.y=-4x-4C.y=-x+2D.y=2x-1
单选题Because time in India is conceived statically rather than dynamically,
Indian languages emphasize nouns rather than verbs, since nouns express the more
______ aspects of a thing.
A. paradoxical
B. prevalent
C. temporal
D. stable
单选题
单选题已知a，b，c为正数，若方程ax
2
+bx+c=0有两个不等实根，则方程a
2
x
2
+b
2
x+c
2
=0______．
单选题已知代数式3y2-2y+6的值为8，那么代数式的值为______。A．1B．2C．3D．4
单选题直线y=kx+1(k∈R)与椭圆(或圆)恒有公共点，则实数m的取值范围是______。
单选题A good deal of the ______ for his achievement in this field must go to
his supervisor, Professor Fang.
A. credit
B. reputation
C. respect
D. praise
单选题
单选题
单选题抛物线y2=-8x中，以点(-1，1)为中点的弦所在的直线的方程为( )． (A) x-4y-3=0 (B) x+4y+3=0 (C) 4x+y-3=0 (D) 4x+y+3=0
单选题There was a noisy ______ at the back of the hall when the speaker began
his address.
A. interaction
B. irritation
C. disturbance
D. interruption
单选题已知函数f(x)对任意的有f(x)+f(-x)=0，且当x＞0时，f(x)=ln(x+1)，则函数f(x)的大致图像为______．A．B．C．D．