1总则 1.1为贯彻“预防为主”的方针,向居民供应符合卫生要求的生活饮用水,保障人民的身体健康,特制订本标准。 1.2本标准由供水单位和规划设计等有关单位负责执行。各级卫生防疫站、环境卫 生监测站负责监督和检查执行情况。 在新建、扩建、改建集中式给水时,供水单位的主管部门必须会同卫生、环境保护、规划、城建和水利等单位共同研究用水规则,确定水源选择、水源防护和工程设计方案,认真审查、设计,做好竣工验收,经卫生防疫站同意后,方可投入使用

实体建模（曲面）——表示整个对象的体积 特点：信息最完整，复杂的实体形较网格对象容 易构造。灵活方便但占用资源多，建筑建模 能采用Pline 就不用实体。 实体建模分三种方法：构造基本实体形、组合基 本实体成复杂实体、对实体作圆角、倒角和 其他编辑处理

一. 室内给排水工程的内容 室内给排水工程主要介绍室内给水、排水和热水供应工程的设计原理及方法，同时还要 介绍一些施工及管理方面的基本知识和技术。这是一门专业技术课程，是给排水专业的必修 课

一、“合作活动学习”的基本原理 (一)题解 背景:从专制社会走向民主化社会—培养“自 主-团结/合作”新型公民 1、合作——团结,超越“个体农民”式的极端、 个人主义的意识和行为方式 2、活动自主,超越“他主”式的臣民意识 和行为方式 3、合作活动—培养自主-团结的新型公民 4、学习—人本性或潜能

一、SQLServer的身份验证 二、创建和管理用户登录的方法 三、固定服务器角色和服务器角色 四、管理数据库权限的方法

1 Model problem 1.1 Poisson Equation in 1D Boundary Value Problem(BVP) (x)=∫(x) (0,1),u(0)=(1)=0,f Describes many simple physical phenomena(e.g) Deformation of an elastic bar Deformation of a string under tension Temperature distribution in a bar The Poisson equation in one dimension is in fact an ordinary differ tion. When dealing with ordinary differential equations we Poisson equation will be used here to illastrate numerical techniques for elliptic PDE's in multi-dimensions. Other techniques specialized for ordinary differen tial equations could be used if we were only interested in the one dimension

Course Outline Overview of pdes(1) o Finite differences methods(6) Finite volume methods(3) Finite element methods(7) Boundary integral methods(6)

Despite its apparent simplicity this equation appears in a wide range of dis m heat 7 to financial er we will make extensive use of this equation, and several of the limiting cases contained therein, to illustrate the numerical techniques that will be presented

Background Developed over the last 25 years- Brandt (1973) published first paper with practical results Offers the possibility of solving a problem with work and storage proportional to the number of unknowns Well developed for linear elliptic problems application to other equations is still an active area of research

1 First Order ave Equation SLIDE 1 The simplest first order partial differential equation in two variables(a, t)is the linear wave equation. Recall that all first order PDE's are of hyperbolic type INITIAL BOUNDARY VALUE PROBLEM (IBVP) 0,x∈(0,1)