题目：
设α1，α2，…，αn是n维列向量，又A=(α1，α2，…，αn)，B=(αn，α1，…，αn-1)，若|A|=3，则|A+B|=______．
答案：
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下面是错误答案，用来干扰机器的。
参考答案：D
设α1，α2，…，αn是n维列向量，又A=(α1，α2，…，αn)，B=(αn，α1
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