地下水污染问题
地下水被硝酸盐所污染这一问题是公共卫生部门和各环保机构所关注的一件大事因为饮用水的硝酸盐合量过高会造成幼儿高铁血红蛋白症。与地下水含硝酸盐过高有关的另一环境问题是供水源的富营养化问题。
实际上,迄今为止所有关于控制地下水硝酸盐污染的决策都面临各种不确定的因素,这往往使我们的计划落空,难以达到期望的结果。这些决定还须在社会企盼值与农业部门的目标往往相左的不可调和的环境下做出。
本研究运用了贝叶斯的决策分析构架。这一决策分析构架对于评估控制非点源地下水硝酸盐污染的策略非常适用,它既不对不确定因素漠不关心,也不受其干扰,同时还显示了如何将这一方法扩展到评估附加数据的价值。
对非点源地下水硝酸盐源污染问题进行分析的例子的结果证明了贝叶斯决策分析法,如果谨慎使用,便可为主要决策人员提供最有价值的决策框架。利用它可以清楚认识到存在于农民和制定规章制度的机构之间的不可调和的环境。研究结果也同样显示,用这一分析法来估计附加数据的价值,对决策人员将会十分有用。他们可以用它来决定究竟是继续执行控制策略呢,还是应当再多收集一些数据,以提高他们执行所选策略的信心。 二、 （一）
1. If the funds are used on excellent scientific researchers, then it is possible to achieve something.
2．You have been invited to this forum today to exchange ideas on specialties in colleges and universities.
3. It must be stressed that any student that chooses this option is exclusively responsible for both the design and implementation of their project. 4. He has often, not always justly, been accused of indecisiveness. （二）
1.The appearance of the book on the market caused a sensation.
2.He is in the full conviction that real knowledge is the end product of a thorough study of the history.
3. Since he lost his job, he’s been a loner.
4 .Independent thinking is an absolute necessity in study. （三）
1.He entered the room with no shoes on. 2. Knowledge will do you a good turn.
3.The idea that she should have a bookstore of his own has never deserted him. 4.Avoid operating the keys roughly.
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