bi levelbaiˈlevl短语¹⁴⁴⁹⁷²⁺² 基本例句 错落式住宅 A fuzzy mathematical approach is proposed for bi level programming problems in which the upper level has constraints and the lower level consists of N independent programming units. 针对上层有约束条件、下层有 N个独立的决策单元的二层线性规划问题,提出了一种模糊数学解法。 cnki