设 3 阶方阵 A=(α1,α2,α3),其中αi(i=1,2,3)为 A 的列向量,若|B|=|(α1+2α2,α2,α3)|=6,则|A|=( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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