排序方式： 共有13条查询结果，搜索用时 15 毫秒
1.
Most electronics products use PCB to carry electronic circuits. This paper classifies information contained in PCB-based electronic circuits into several models: geometry model, physics model, performance model and function model. Based on this classification, a multi-information model of product is established. A composite model of product is also created based on object-orientation and characteristics of the product. The model includes a 3D geometry model, a physics model with integrated information that can be divided into microscopic and macroscopic information, a generalized performance model and a function model that are from top to bottom. Finally, a multi-unit analysis is briefly discussed. 相似文献
2.
数学新教材打破了传统教材中的框框条条,删繁就简,标新立异,既改变了以往数学过分注重知识本身严密性、逻辑性和系统性的特点,又突出了数学学习的实用性、普及性、实践性、开放性和创造性。新教材体现了当今课程改革的新理念、新方法。 相似文献
3.
研究结果表明,在NH4+加入量较低时,随着NH4+加入量的增加,土壤对NH4+的吸附量呈线性增加,但NH4+的吸附率呈下降趋势;三种土壤对NH4+吸附量大小顺序为们土＞黄褐土＞水稻土． 相似文献
4.
5.
6.
7.
数学新教材打破了传统教材中的框框条条,删繁就简,标新立异,既改变了以往数学过分注重知识本身严密性、逻辑性和系统性的特点,又突出了数学学习的实用性、普及性、实践性、开放性和创造性.新教材体现了当今课程改革的新理念、新方法. 相似文献
8.
实践性教学作为财会专业教学的一个环节,其重要作用已被人们普遍认识。各校教师都把它列为教学改革的重要内容,千方百计地采用各种形式,加强实践性教学。然而,要使实践性教学取得较显著的效果,还有赖于对财会专业的实践性教学作出整体规划和合理布局,合理安排各种实践性教学活动,根据循序渐进的认识规律,引导学生从基础到专业,从单项到综合,从校内模拟到校外实践,从平时经常性作业到毕业前综合性实习,进行成龙配套、环环相扣 相似文献
9.
随着当前互联网的飞速发展,当前使用的基于IPv4网络协议下的地址数显得越来越匮乏,因此IETF提出用IPv6协议取代IPv4协议。IPv6具有诸如海量地址、组播、邻居发现、自动配置等许多新特性。然而,怎样实现IPv4向IPv6的平滑过渡,以及怎样在现有IPv4网络上进行IPv6组网仍然是目前有待解决的问题。本文对目前常用的三种过渡技术双协议栈、隧道和地址翻译机制进行分析比较。 相似文献
10.
Most electronics products use PCB to carry electronic circuits. This paper classifies information contained in PCB-based electronic circuits into several models: geometry model, physics model, performance model and function model. Based on this classification, a multi-information model of product is established. A composite model of product is also created based on object-orientation and characteristics of the product. The model includes a 3D geometry model, a physics model with integrated information that can be divided into microscopic and macroscopic information, a generalized performance model and a function model that are from top to bottom. Finally, a multi-unit analysis is briefly discussed. 相似文献