2019年美国大学生数学建模竞赛特等奖论文题目如下A.GameofEcologyB.SendintheDrones:DevelopinganAerialDisasterReliefResponseSystemC.TheOpioidCrisisD.TimetoleavetheLouvreE.WhatistheCostofEnvironmentalDegradation?F:Universal,Decentralized,DigitalCurrency:Isitpossible?