stressed that promoting the comprehensive revitalization should focus on economic construction as the central focus with, pay special attention to grasp the implementation of five development concepts, deepening reform and promoting the all-round opening up, ensuring and improving peoples livelihood, strengthen the construction of ecological civilization, five priorities, play development mix. To with new development concept measure work, and command action, and training cadres, in implement implementation new development concept in the looking for opportunities, and build highlights, and expand advantage; to full deepening reform, break bound the aspects created vitality of system mechanism obstacles; to active advance full aspects opening, participation in the cast Russian Economic Corridor construction; to guarantees and improved livelihood, strongly won poverty battle; to strengthening ecological civilization construction, for sustainable development reserved space, for future generations left sky blue, and to green, and water clear of better homes. We must in-depth implement implementation new development concept, insisted to economic construction for Center, firmly caught development this first priority, absorbed make construction, heart no distractions caught development, speed up development six big industry, in-depth implementation three big engineering, active create two big environment, out of a article quality more high, and benefits better, and structure more excellent of transformation development of road. To strengthen ecological construction. On March 22, the deep restructuring examined and adopted the opinion on perfecting compensation mechanism of ecological protection, proposed to explore the establishment of diversified ecological compensation mechanism, progressive realization of forests, grasslands, wetlands and other areas of focus and key ecological function and other important regional ecological compensation coverage, the ecological advantages of the region will be further highlighted. We need to go green eco-building, as the essential policy, in strict accordance with the State of main function region construction requirements, careful implementation and Xiaoxing an mountains forest ecological protection and economic restructuring plan for the construction of sky blue, . Acts prohibited by picking up the remaining wells in standing timber. To focus on forest resource conservation, increase the acquisition and supervision of cold storage, no buy fruit, encourage support to leading enterprises, workers cooperatives as a unit, the contract management of forest resources, the rational protection and utilization of resources. To work actively towards policy aimed from the level of the State Forestry Administration formulated regulations to protect forest resources as soon as possible to achieve law and regulation to protect forest resources. Should focus on forest fire prevention. Fire safety is the first priority一、工字型的绘制步骤一：设置好绘图单位、绘图范围、线型、图层、颜色，打开捕捉功能。从下拉菜单ViewDisplayUCSIconOn关闭坐标显示。步骤二：根据图1所示尺寸绘制图形，得到如图11所示封闭图形。步骤三：创建面域。在命令栏Command：输入Region，用框选方式全部选中该图形，回车。出现提示：1 loop extracted，1 Region created，表示形成了一个封闭图形，创建了一个面域。步骤四：对该面域进行拉伸操作。DrawSolidsExtrude，选中该面域的边框，回车。在命令栏提示：Specify height of extrusion or Path：30，回车，再回车。三维工字形实体就生成了。步骤五：观察三维实体。View3D ViewsSW Isometric，再从ViewHide进行消除隐藏线处理，观察，最后进行着色渲染，ViewShadeGouraud Shaded，如图12所示。图12 三维效果图图11 平面图二、二维五角形到三维五角星的绘制步骤一：设置好绘图单位、绘图范围、线型、图层、颜色，打开捕捉功能。步骤二：绘制一个矩形，以矩形中心为圆心，作一个圆及一个椭圆，修整直线。图22 图21 步骤三：阵列直线，创建光线效果。将直线段在360度范围内阵列72个，形成光线效果步骤。步骤四：修整直线。以椭圆为边界，将直线每隔一条修剪至椭圆；同时以矩形为边界，将矩形外的线条全部修剪至矩形；矩形内没修的剪线条延伸至矩形。步骤五：绘制五角形。在上图的旁边绘制一个圆，再绘制这个圆的内接正五边形。将五边形的五个端点连成直线，修剪掉每边的中间部分就得到五角形。步骤六：绘制五角星。先用交叉窗口选择的方法将五角形做成面域，再将其拉伸成高度为30、角度为30的五角星。步骤七：移动图形。将五角星移到步骤四所绘的图形中，删除绘图用到的辅助图形，如矩形、椭圆、大小圆、正五边形。图24 图23 图26 图25 三、汤勺主视图、纵截面轮廓线图和横截面图的尺寸，进行实体造型。图31 步骤一：绘图准备。新建一个图形文件，选择公制，设置适当的图层、线型、颜色、绘图范围和绘图对象捕捉方式。步骤二：绘制汤勺主视图。先分析汤勺的造型特点，上下可由一个椭圆经修剪得到，上椭圆尺寸是2040，下椭圆尺寸是830，两椭圆中心距是65。步骤三：修改完善主视图。 图32 中间联接处由直线组成，两直线一端点分别过上椭圆中心，另一端点分别相切于下椭圆轮廓两边。修剪直线和上下椭圆。再将上椭圆与直线联接处两边倒圆角R10。步骤四：绘制汤勺纵截面轮廓线。汤勺的纵截面轮廓线是一条光滑曲线，构图时可选用多义线，根据坐标值或栅格点绘出。在缺少精确尺寸时，可任选若干点拟合，用多义线Spline命令绘出其基本轮廓形状。步骤五：修改完善汤勺纵截面轮廓线。如图所示用小圆标记的交点1、2、3、4、5、6、7处，用Spline来绘制成所需要的曲线。注意：1处要比汤勺主视图的勺尖长些。图33 图34 步骤六：绘制汤勺横截面图。 汤勺横截面是由两段圆弧和两段直线组成，可通过两个圆修剪而成。步骤七：做成面域。将汤勺主视图和汤勺横截面图做成面域，在西南轴测方向观测。步骤八：做成三维实体。 先将汤勺主视图拉伸成三维，再调整汤勺纵截面轮廓线方向及横截面方向。 步骤九：拉伸成曲面实体。 先将横截面移到纵截面轮廓线一端，再把纵截面轮廓线作为路径，拉伸成三维实体。 步骤十：三维实体求交运算。图35 先将图的截面体分二次移到图平面体中部，再执行求交运算，注意两图要完全重叠，否则结果不完整。图36 步骤十一：整理图形。上下棱边倒圆角。步骤十二：出效果图，渲染着色显示。图37 CAD绘制三维实体基础1、三维模型的分类及三维坐标系； 2、三维图形的观察方法； 3、创建基本三维实体； 4、由二维对象生成三维实体； 5、编辑实体、实体的面和边； 1、建立用户坐标系； 2、编辑出版三维实体。