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【单选题】
以下关于层次分析法的基本步骤，正确的顺序是（）.①计算单排序权向量并作一致性检验；②构造成对比较矩阵；③建立层次结构模型；④计算单排序权向量并作一致性检验；⑤作出相应决策；A.
①②③⑤④
B.
②①④③⑤
C.
③②①④⑤
D.
③②④①⑤
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