In the first chapter , the history and present situations , the new results and the existing questions of researchs on unsteady well flow problems are introducted . further more , the questions to be researched in this thesis are outlined . in the second chapter , the specific discharges , the drawdowns and the well functions are derived on two - regime well flow problems about two kinds of common seepage laws (五)结论在第一章中，详细地介绍了地下水非稳定井流问题研究的历史与现状，总结了前人在地下水渗流规律研究方面得到的一些结果，客观地分析了目前线性与非线性两种流态并存区域上非稳定井流问题解析解的研究成果及存在的问题，并确定了本论文所要研究的问题。
Part two analysis the standards which used to judge who is a holder in due course . part three illustrates the rights of holder in due course combining with the problems in practice . finally the last part gives the suggestions on how to build perfect chinese bill of exchange law 第一部分主要探讨正当持票人制度的基本理论问题;第二部分着重分析英美法上正当持票人身份的判定标准;第三部分结合正当持票人制度在适用中所存在的问题解析正当持票人的权利;第四部分结合我国票据立法的现状,提出了借鉴正当持票人制度的有关规定,完善我国票据立法的构想。
Here a suggestion is presented that the mental process of senior chemistry experimental problem - solving can be divided into four periods such as problem confirming , problem parsing , experiment design and experiment operation , and there are six representation patterns of chemistry experimental problem , for instance , character representation , chemistry representation , sample representation , visualization representation , skill representation and mathematic representation . at the same time , problem solving strategies also can be divided into principle guide , sample guide , environment guide and blind attempt 作者提出高中学生解决化学实验问题的心理过程可分为问题确认、问题解析、实验设计和实验操作四个阶段，他们对化学实验问题的表征方式有字面表征、化学表征、样例表征、形象表征、技能表征和数学表征等六种，而解决策略则可分为原理导向、样例导向、情境导向和盲目尝试四种。
