摘要 论述了CADPCAM软件一种常用图形交换文件(DXF 文件) 的结构和基于DXF 文件平面数控加工的NC 代码生成 软件的接口技术、总体框架设计及NURBS 曲线分析和NC 代码生成。 关键词:图形交换文件 NC 代码 NURBS 曲线 中图分类号:TG659 文献标识码:B 文章编号:1671 —3133 (2002) 02 —0020 —02
上传时间： 2014-12-04
上传用户：ANRAN
The Original USB 2.0 specification released on April 27, 2000 Errata to the USB 2.0 specification as of December 7, 2000 Mini-B connector Engineering Change Notice to the USB 2.0 specification. Pull-up/pull-down Resistors Engineering Change Notice to the USB 2.0 specification. Errata to the USB 2.0 specification as of May 28, 2002 Interface Association Descriptor Engineering Change Notice to the USB 2.0 specification. Rounded Chamfer Engineering Change Notice to the USB 2.0 specification as of October 8, 2003 Unicode Engineering Change Notice to the USB 2.0 specification as of February 21, 2005 Inter-Chip USB Supplement Revision 1.0 as of March 13, 2006 Revision 1.3 of the USB On-The-Go Supplement as of December 5, 2006 Revision 1.01 of the Micro-USB Cables and Connectors Specification as of April 4, 2007 USB 2.0 Link Power Management Addendum Engineering Change Notice to the USB 2.0 specification as of July 16, 2007.
标签： specification 2.0 USB Original
上传时间： 2013-12-31
上传用户：familiarsmile
一个掌上电脑PPC用的汇率转换软件，简单易用。 用于windows mobile2003或者2002以上。
上传时间： 2013-12-29
上传用户：mpquest
Essential C++ By Stanley B. Lippman Publisher : Addison Wesley Pub Date : September 12, 2002 ISBN : 0-201-48518-4 Pages : 416
标签： B. Essential Publisher September
上传时间： 2016-01-30
上传用户：zhengjian
已知美国从1920-1970年的人口表如下： 年份 1920 1930 1940 1950 1960 1970 人口（千人） 105711 123203 131669 150697 179323 203212 （1）用表中数据构造一个5次Lagrange插值多项式，并以此估计1965、2002年的人口。 （2）用Newton插值估算1965、2002年的人口数。
上传时间： 2016-02-07
上传用户：lgnf
本小节通过一个简单的实例来讲述ARX程序的创建过程，介绍编制Object ARX程序的一些基本步骤和原则，并初步了解ARX程序与AutoCAD进行通讯的方式。如同学习其它计算机语言一样，我们首先来创建一个最简单的ARX程序—“Hello.ARX”，在AutoCAD 2002中加载并运行该程序，将会在命令行出现－“Hello, ObjectARX!”。
上传时间： 2016-02-19
上传用户：AbuGe
两种解决方案 Richard just finished building his new house. Now the only thing the house misses is a cute little wooden fence. He had no idea how to make a wooden fence, so he decided to order one. Somehow he got his hands on the ACME Fence Catalogue 2002, the ultimate resource on cute little wooden fences. After reading its preface he already knew, what makes a little wooden fence cute. A wooden fence consists of N wooden planks, placed vertically in a row next to each other. A fence looks cute if and only if the following conditions are met: ?The planks have different lengths, namely 1, 2, . . . , N plank length units. ?Each plank with two neighbors is either larger than each of its neighbors or smaller than each of them. (Note that this makes the top of the fence alternately rise and fall.)
标签： house the finished building
上传时间： 2014-01-26
上传用户：541657925
AES的基本要求是，采用对称分组密码体制，密钥长度的最少支持为128、192、256，分组长度128位，算法应易于各种硬件和软件实现。1998年NIST开始AES第一轮分析、测试和征集，共产生了15个候选算法。1999年3月完成了第二轮AES2的分析、测试。美国标准与技术研究院（NIST）于2002年5月26日制定了新的高级加密标准（AES）规范。
标签： AES
上传时间： 2016-02-29
上传用户：han_zh
2001年春季的IDF上Intel正式公布PCI Express，是取代PCI总线的第三代I\O技术，也称为3GIO。该总线的规范由Intel支持的AWG（Arapahoe Working Group）负责制定。2002 年4月17日，AWG正式宣布3GIO 1.0规范草稿制定完毕，并移交PCI-SIG进行审核。开始的时候大家都以为它会被命名为Serial PCI（受到串行ATA的影响），但最后却被正式命名为PCI Express。2006年正式推出Spec2.0（2.0规范）
上传时间： 2013-12-19
上传用户：hgy9473
A Case Study: Replacing the persistence layer of a Business Process Engine with JDO The JDO specification (JSR-12) was released from the Java Community Process in April 2002. Its goal is to provide transparent persistence to Java classes. David Jordan provides a concise introduction. Several books are becoming available that provide a more complete description of JDO3.
标签： persistence Replacing JDO Business
上传时间： 2014-01-27
上传用户：541657925
