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【简答题】
将向量组α 1 ，α 2 ，α 3 单位正交化，其中α 1 =(1，2，2，-1) T ，α 2 =(1，1，-5，3) T ，α 3 =(3，2，8，-7) T
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【单选题】How does the woman react to Tom's idea?
A.
She wonders if she can afford it.
B.
She doesn't want to bother Tom's roommate.
C.
She thinks it won't work.
D.
She thinks it's a good idea.
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