当色差信号满足下列哪种情况时,才可能是白光?( )
A: R-Y
=0
B: B-Y
=0
C: R-Y
=B-Y =0
A: R-Y
=0
B: B-Y
=0
C: R-Y
=B-Y =0
举一反三
- NTSC制采用的传输信号是( ) A: R、G、 B: Y、R-Y、B-Y C: Y、R-Y、G-Y D: Y、I、Q
- p>有一函数[br][/br] ┌1x>0[br][/br]y=┤0x=0[br][/br] └-1x<0[br][/br]以下程序段中不能根据x的值正确计算出y的值的是______。</p A: p>if(x>0)y=1;elseif(x==0)y=0;elsey=-1; B: y=0;if(x>0)y=1;elseif(x<0)y=-1; C: y=0;if(x>=0)if(x>0)y=1;elsey=-1; D: if(x>=0)if(x>0)y=1;elsey=0;elsey=-1;
- 下列Matlab代码,能求解微分方程 y'(t) = 2*t , y(0) = 1的是( ) A: tspan = [0 5];<br> y0 = 0;<br> [t,y] = ode45(@(t,y) 2*t, tspan, y0); B: tspan = [0 5];<br>y0 = 1;<br>[t,y] = ode45(@(t,y) 2*t, tspan, y0); C: tspan = [0 5];<br>y0 = 1;<br>[t,y] = ode45(@(t,y) 2*y, tspan, y0); D: tspan = [0 5];<br>y0 = 1;<br>[t,y] = ode45(@(t,y) 2*t*y, tspan, y0);
- 在回归直线y=a+bx,b<0,则x与y之间的相关系数()。 A: Ar=0 B: Br=1 C: C0<r<1 D: D-1<r<0
- 求分段函数的值,正确的程序是(;;;;; )。<img src="http://edu-image.nosdn.127.net/F092417E3F0EA5BFC3C0B8532CAE32F7.jpg?imageView&thumbnail=890x0&quality=100" />? x=input('x=:');<br >y=(x+10)*(x>0)+(x-10)*(x<=0);<br >disp(y)|x=input('x=:');<br >y=x+10;<br >if x<=0<br >;;; y=x-10;<br >end<br >disp(y)|x=input('x=:');<br >if x>0<br >;;; y=x+10;<br >else<br >;;; y=x-10;<br >end<br >disp(y)|x=input('x=:');<br >if x>0<br >;;; y=x+10;<br >elseif x<=0<br >;;; y=x-10;<br >end<br >disp(y)