精选优质文档-倾情为你奉上摘要第一段:写论文解决什么问题 1 问题的重述 a. 介绍重点词开头:例1:“Hand move” irrigation, a cheap but labor-intensive system used on small farms, consists of a movable pipe with sprinkler on top that can be attached to a stationary main. 例2:is a real-life common phenomenon with many complexities.例3:An (effective plan) is crucial tob. 直接指出问题:例 1:We find the optimal number of tollbooths in a highway toll-plaza for a given number of highway lanes: the number of tollbooths that minimize