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【单选题】
假设一个15阶的上三角矩阵A按行优先顺序压缩存储在一维数组B中，则非零元素A[9,9]在B中的存储位置k为（ ）。（注：矩阵元素下标从1开始）
A.
94
B.
93
C.
92
D.
91
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