A: n0=3,n1=8,n2=9,nn=1
B: n0=2,n1=5,n2=1,nn=1
C: n0=2,n1=7,n2=10,nn=1
D: n0=4,n1=8,n2=9,nn=1
举一反三
- 设n=n1n2,(n1,n2)=1,n1≥1,n2≥1,则φ(n)=φ(n1)φ(n2).若n=n1n2,n1≥1,n2≥1,则φ(n)=φ(n1)φ(n2)?
- int n=1,a;if(n++==1){ printf("n0=%d\n",n); printf("n1=%d\n",++n); printf("n2=%d\n",n++);}else{ printf("n3=%d\n",n);printf("n4=%d\n",--n);printf("n5=%d\n",n--);}
- 下面N×N的笛卡尔积的子集中,哪些可以构成函数? A: {(n1,n2) | n1,n2∈N and n1+n2 <10} B: {(n1,n2) | n1,n2∈N and n2 = n1^2} C: {(n1,n2) | n1,n2∈N and n1 = n2^2} D: {(n1,n2) | n1,n2∈N and n2为小于n1的素数个数}
- 计算下列序列的N点DFT。(1)x(n)=1(2)x(n)=δ(n)(3)x(n)=δ(n一n0),0<n0<N(4)x(n)=Rm(n),0<m<N(7)x(n)=ejω0nRN(n)(8)x(n)=sin(ω0n)RN(n)(9)x(n)=cos(ω0n)RN(n)(10)x(n)=nRN(n)
- 程序的运行结果是( )[img=196x416]17d6045dbe6bfe2.jpg[/img] A: n=0;n=1; B: n=1;n=2; C: n=2;n=2; D: n=0;n=0;
内容
- 0
对于给定的正数a(0〈a〈1),设za,χ2a(n),ta(n),Fa(n1,n2)分别是标准正态分布,χ2(n),t(n),F(n1,n2)分布的上a分位点,则下面的结论中不正确的是() A: z(n)-z(n) B: χ(n)=-χ(n) C: t(n)=-t(n) D: F(n,n)=1/F(n,n)
- 1
中国大学MOOC: 以下程序输出的结果是()# include <stdio.h>int main(){ int a = 4; switch(a ) { case 0: printf("this is 0\n"); break; case 1: printf("this is 1\n"); break; case 2: printf("this is 2\n"); break; default: printf("this is default\n"); } return 0;
- 2
异步电动机起动的瞬间,转速n与同步转速[img=16x15]17e0a6bd971b38e.jpg[/img]的关系为( )转差率( ) A: n=0,s=1 B: n=n0,s=0 C: n>n0,s<0 D: n<0,s>1
- 3
下列程序输出结果是:() int i,j,m,n; m=n=0; for(i=0;i[2;i++) for(j=0;j<2;j++) if(j]=i)m=1;n++; printf("n=%d\n",n); A: 4 B: 3 C: 2 D: 1
- 4
请读程序:main(){ static int a[]={1,2,3,4,5,6} int *p; int i; p=a; *(p+3)+=2; printf("n1=%d,n2=%d\n:",*p,*(p+3));}其输出是________。A、n1=1;n2= 5 B、n1=2,n2=6 C、n1=1 n2=7 D、n1=1,n2=6