设向量组A:α1=(1,0,5,2),α2=(-2,1,-4,1),α3=(-1,1,t,3),α4=(-2,1,-4,1)线性相关,则t必定等于().
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
免费的网站请分享给朋友吧