题型:问答题 To my mind, the secret to happiness__________ your successful work and your contribution towards others’ happiness.A.results inB.consists inC.brings inD.takes in 查看答案
题型:问答题 已知α1=(-1,1,a,4)T,α2=(-2,1,5,a)T,α3=(a,2,10,1)T是四阶方阵A的属于三个不同特征值的特征向量,则a的取值为()。A.a≠5B.a≠-4C.a≠-3D.a≠-3且a≠-4 查看答案