中国大学MOOC: In 1978，China and U.S.A. normalized their relationship.

雨课堂: 语法判断 The channel vectors are normalized by a global normalization value A that is the largest absolute value in the whole dataset, and can be expressed as A=B+C.

图形窗口的Units属性默认值是pixels,而坐标轴的Units属性默认值是normalized。A.()√()B.()×

Design a digital low-pass filter with a passband edge frequency of 1kHz, a stopband edge frequency of 1.5kHz and a sampling frequency of 8kHz. What are the corresponding normalized edge frequencies ωp and ωs? A: ωp=0.25π，ωs=0.375π B: ωp=0.125π，ωs=0.1875π C: ωp=0.25， ωs=0.375 D: ωp=0.125， ωs=0.1875

Design a low-pass digital filter for filtering analog signals. Its passband frequency is1.25kHz，and stopband frequency is 3.4kHz.The sampling frequency is 8kHz.The normalized cutoff frequency of the digital low-pass filter is ( ) A: ωp=2500π，ωs=6800π B: ωp=2500π，ωs=0.85π C: ωp=0.3125π，ωs=6800π D: ωp=0.3125π，ωs=0.85π

In the following statement, the statement which generates the button control is ( ). A: h_1=uimenu(gcf,'Label','&Blue'); B: h_1=uicontrol(gcf,'style','push', 'string','grid off','callback','grid off'); C: h_1=uicontrol(gcf,'style','text', 'horizontal','left','string',{'Input'}); D: h_1=axes('unit','normalized','position',[0,0,1,1],'visible','off');

In the following statement, the statement which generates the button control is ( ). A: h_1=uimenu(gcf,'Label','&Blue'); B: h_1=uicontrol(gcf,'style','push', 'string','grid off','callback','grid off'); C: h_1=uicontrol(gcf,'style','text', 'horizontal','left','string',{'Input'}); D: h_1=axes('unit','normalized','position',[0,0,1,1],'visible','off');