题型:选择题 There are a few miles to the top of the mountain. If we hold on, we will ______. [ ]A. reach B. get to C. come true D. make it 查看答案
题型:单项选择题 设A是三阶矩阵,有特征值λ1=0,λ2=1,λ3=-1.对应的特征向量分别是ξ1,ξ2,ξ3,则非齐次线性方程组AX=ξ2+ξ3的通解是 ( ).A.k1ξ1+k2ξ2+ξ3.B.)k1ξ1+k2ξ3+ξ2.C.kξ1-ξ2+ξ3D.kξ1+ξ2-ξ3. 查看答案