图示正方形对x,y轴的惯性矩阵和惯性积分别为Ix,Iy和Ixy,下列结论中哪些是正确的?( ) (1)Ix=Iy; (2)Ix’=Iy’; (3)Ix=Ix’; (4)Ixy=Ix’y’http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/06df735ae8734b3f995cf9274f091650.png
全对
举一反三
- 如图所示,已知直径为d的圆形ABCD对x,y轴的惯性矩和惯性积分别为Ix=Iy=πd4/64,Ixy=0,则下列结论中哪些是正确的? (1)半圆形ABC对x,y轴的惯性矩和惯性积分别为Ix=Iy=πd4/128,Ixy=0; (2)直角扇形0AB对x,y油的惯性矩和惯性积分别为Ix=Iy=πd4/256,Ixy=0; (3)扇形0ABCD对x,y油的惯性矩和惯性积分别为Ix=Iy=πd4/256,Ixy>0。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201808/df368c7326e7437e8a2e3265b096f8e3.png
- 如图所示,已知直径为d的圆形ABCD对x,y轴的惯性矩和惯性积分别为Ix=Iy=...Ix=Iy=πd4/256,Ixy>0。
- 图示直角三角形对x,y轴的惯性矩和惯性积分别为Ix、Ix和Ixy。下列结论中哪些...8b8ddcdf2faf832a.png
- 函数f:X→Y,其中IX是X→X的恒等函数,IY是Y→Y的恒等函数,则有: A: f -1∘ f = IY B: f∘ f-1 =IX C: f =f ∘ IX D: f =f ∘ IY
- 下面程序的运行结果是 iX=80,iY=25____。void main(){ int iX,iY;iX=80;iY=25;printf("iX=%d,iY=%d\n",iX,iY);printf("iX/iY=%d,iX%iY=%d\n",iX/iY,iX%iY);}
内容
- 0
void main() { int iX,iY,iM,iN; iX=10;iY=20; iM=iX++;iN=++iY; printf("iX=%d,iY=%d,iM=%d,iN=%d",iX,iY,iM,iN); iM=iX– –;iN=– –iY; printf("iX=%d,iY=%d,iM=%d,iN=%d",iX,iY,iM,iN); }
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图示正方形对x,y轴的惯性矩阵和惯性积分别为ix,
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设函数f: X→Y,则下面正确的是( )。 A: f ∘ IX=f B: IX∘f=f C: f∘IY=f D: IY∘ f=f
- 3
设iX=2,iY=3, ch='a',则表达式iZ = (iX || iY)&&(ch>'A')的值是1
- 4
#include "stdio.h" void main() { int iX,iY,iM,iN; iX=10;iY=20; iM=iX++;iN=iY++; printf("iX=%d,iY=%d,iM=%d,iN=%d",iX,iY,iM,iN); iM=iX--;iN=--iY; printf("iX=%d,iY=%d,iM=%d,iN=%d",iX,iY,iM,iN); }