设4阶矩阵A=(aij)不可逆,a12的代数余子式A12不等于0,为矩阵A的列向量组
如图,连续函数y=f(x)在区间[-3,-2],[2,3]上的图形分别是直径为1的上、下半圆周,在区间[-2,0],[0,2]的图形分别是直径为 则下列结论正确的是()
Theyfulfilledtheplanmuchearlierthanthey_____
You'veonlygotaslightcold.You'll_____itinadayortwo.
In1991,whilet11eeconomiesofindustrializedcountriesmetaneconomic_____,theeconomiesofdevelopingcountriesweregrowingveryfast.