若集合M={(x,y)| 3x一2y=-l),N={(x,y)| 2x+3y=8),则M∩N=() A.(1,2) B.{1,2) C.{(1,2)} D.φ
2022-01-07
有5部各不相同的手机参加展览,排成一行,其中有2部手机来自同一厂家,则此2部手机恰好相邻的排法总数为() A.24 B.48 C.120 D.60
2022-01-07
I want to be told all _______. A. which happen B. which happened C. that had happened D. that had been happened
2022-01-07
从甲口袋内摸出一个球是红球的概率是0.2,从乙口袋内摸出一个球是红球的概率是0.3.现从甲、乙两个口袋内各摸出一个球,这两个球都是红球的概率是() (A)0.94 (B)0.56 (C)0.38 (D)0.06
2022-01-07
下列函数中,函数值恒大于零的是() (A)y=x2 (B)y=2x (C)y=㏒2x (D)y=cosx
2022-01-07
We can’t _______ another 100 kilometers any more. A. have B. turn C. make D. reach
2022-01-07
函数y=x3+3x2-1() A.没有极大值 B.没有极小值 C.极大值为-l D.极小值为-l
2022-01-07
通过点(-3,1)且与直线3x-y-3=0垂直的直线方程是()
2022-01-07
圆心在点(5,0)且与直线3x+4y+5=0相切的圆的方程是()
2022-01-07
在区间(0,+∞)内是单调增函数的是()
2022-01-07