说明：  投资组合与模糊规划模型 本文能针对问题的要求通过分析，建立正确的数学模型，并用偏好系数加权法把双目标优化问题，转化为单目标优化问题。
(Investment portfolio and fuzzy programming model In this paper, a correct mathematical model can be established by analyzing the requirements of the problem, and the bi-objective optimization problem can be transformed into a single-objective optimization problem by weighting preference coefficients.)