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magic square
纵横图
将从1至n2的自然数排列成纵横各有n个数的正方形,使每行、每列,有时还包括每条主对角线上的n个数的和都等于,又称n阶幻方。
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vertical-horizontal diagram
纵横图,幻方
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fire safety evaluation system
fire safety inspection system for public places
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fire safety management of museum
fire safety of timber structure
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