问题
选择题
Our teacher wants us to be ______ when we talk with the foreigners. [ ]
A. comfortable
B. unusual
C. grateful
D. confident
答案
答案：D
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Our teacher wants us to be ______ when we talk with the foreigners. [ ]
A. comfortable
B. unusual
C. grateful
D. confident
答案：D
，设d1是矩阵A属于特征值λ=1的特征向量，α2与α3是矩阵A属于特征值λ=5的特征向量，则矩阵P不能是