查询词典 datum level

Good practice in engineering drawing, must be able to consider datum position, key dimension control and tolerance stack-up.

工程制图方面有很好的操作和应用，能够考虑基准的选取和定位、关键尺寸的控制、以及设计制造公差的累积

Good practice in engineering drawing, must be able to consider datum po sition, key dimension control and tolerance stack-up.

工程制图方面有很好的操作和应用，能够考虑基准的选取和定位、关键尺寸的控制、以及设计制造公差的累积？

Software, and simulated by Monte Carlo method. The simulation results are conducted by descriptive statistics. Two "drop-in" assembly design lens groups were studied to calculate the stack-up element tilt and decenter within a cell and the resultant deviations of the optical axes away from the mechanical datum axis. The results indicate that the opto-mechanical tolerance model can analyze the critical to quality parameters of a lens system. As a result, the performance of the lens system can be anticipated by the opto-mechanical tolerance model before mass production.

戊n体编辑，并以蒙地卡罗方法模拟，模拟结果以叙述统计呈现；最后以两个"投入式"组立设计的镜群组为案例，计算镜片在镜筒内的累积偏心角度公差、偏心距离公差及镜片光学轴的累计偏移量，其结果显示该模型可模拟一个镜头系统的关键品质参数；所以，镜头系统的性能在大量生产之前可藉本光机公差模拟模型预测其品质与良率。

The primary goal of this research is to improve the limit of traditional forecasting methods by using grey prediction skill that required just four datum to analyze the teacher supply and demand problem resulted from the reduce of "class size" number. The results are as follows

本文研究的主要目的即针对改善传统预测方法对所需数据个数过多的要求限制，采取灰预测技术仅需四个数据即可加以建模预测，藉以分析因为班级规模人数降低所衍生的师资供需问题。

Although the ordinary stack velocity analysis method has already matured the ordinary NMO equation is based on the supposal that the shot and receiver points are located a same horizontal datum plane .

常规叠加速度分析方法虽然业已成熟，然而常规动校正方程是基于炮，检点处于同一水平基准面的假设，在地表起伏较大的地区，即使采用浮动基准面的方法，其速度分析误差也不容忽视。

Based on the example of turbine reverse engineering , the general procedure that can be used to translate the physical object into CAD datum by Surfacer software is determined in this paper1 By going deep into the vector of point-cloud , it's parametrization can be gained by adopting the precept of accumulating chordal parametrization1 According to the principle of const ructing curve using the least square method , the high quality-curve can be gained by modifying curve's parameter1 This paper also empha2sizes on some methods about processing point-cloud , const ructing curve and const ructing surface1 And it can provide several methods to const ruct high quality2CAD model for mould machining1

此栏目为免费论文，可自行复制获取，如需要其他完整论文，可点击论文范文查找摘要本文就涡轮反求造型的实例，采用Surfacer 软件规划出由实物转化为工程CAD 资料的一般流程。在深入分析点云数据的矢量方向基础上，采用积累弦长参数化方案实现点云的参数化；根据最小二乘法曲线拟合原理，修改曲线参数获得高品质曲线；并重点论述了点云处理、曲线生成、建构曲面的方法，为模具加工提供了建构高品质CAD 模型的有效途径。

By means of field survey, systems analysis and history datum analytic methods, on the base of natural, social, economic conditions of the source region, the author analyzed the type, characters of vegetation of the source region, then aimed at the problems of produce in source region, and then took out thereinafter conclusions on studying approaches to sustainable utilization of grassland in the source region.

本文通过实地调查、系统分析、历史资料分析的方法，在阐明江河源进行草地生产的自然、社会、经济现状基础上，分析了江河源区植被分布的类型及特点、江河源区草地退化原因，并针对江河源区草地生产存在问题，提出了江河源区草地可持续利用的途径。

Objective:to study the epidemiologic characteristic of mortality of malignant tumors in zhongshan city.method:selecting the investigated datum of mortality of malignant tumor in zhongshan city as sample uses sas statistics software to analyse and forecast the mortality by time series.results:morlality of male malignant tumor and both male and female malignant tumour showed the risen trend from 1970 to 1989.the trend will be kept in future.both will be separately risen to 121.05/105 and 83.92/105 in 2 000.mortality of female malignant tumour will be kept in about 43.59/105 in 2000.couclusion:mortality of both male and female malignant tumor takes on the trend of diffirent change.the male showed risen trend;the female showed the fluctuation of non-trend random.rising mortality of malignant tumor greatly threaden the crowd health.

目的：研究中山市恶性肿瘤死亡率的流行学特点，为制定防治计划提供依据。方法：以中山市恶性肿瘤死亡率调查资料为样本，应用sas统计分析软件对恶性肿瘤死亡率进行时间序列分析与预测。结果：1970～1989年男性恶性肿瘤死亡率和男女合计恶性肿瘤死亡率均呈现上升趋势且有继续保持的趋势。到2000年将分别上升为121.05/10万和83.92/10万左右；女性恶性肿瘤死亡率呈现无趋势的随机波动且将继续保持下去，到2000年保持在43.59/10万左右。结论：中山市男女恶性肿瘤死亡率呈不同变化趋势，男性恶性肿瘤死亡率呈现上升的趋势，女性恶性肿瘤死亡率呈现无趋势的随机波动。恶性肿瘤死亡率的上升对人群的健康构成重大威胁。

Any of the Micron tick mark the number of datum Micron are both zero, in short, squeege instrument slot on both sides is a plane?

任一微米刻度线的基准面的微米数是否均为0μm，简言之，刮板仪槽两边是否为平面？

This paper introduced the solving method of datum transformation parameter and precision check of RTK survey result of the RTK survey in zonal survey area.

介绍了RTK测量在带状测区基准转换参数的求解方法及RTK测量成果的精度检验等情况。

Smoking cigarettes adds to the Computer Desk Computer manufacturer computer mouse Computer Computerized collar knitter machine Conduit Bodies construction board Container Bag Control Arm Cooking Thermometer general levels of air pollution as well as damaging our health.

吸烟不仅对健康有害，而且增加空气污染程度。香烟雾含有多种有害物质：不仅有致癌化学物质、有某种能阻止氧气进入血液的气体，还有引起血压增高、心速加快的被称为尼古丁的物质。

He is one of my favorite actors.

他是我最喜欢的男演员之一。