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The key problem is to synthesize high stereoselectively trans- 2,5- disubstituted tetrahydrofurans. This thesis sets up a new method to synthesize stereoselectively ?ra玸--2,5-disubstituted tetrahydrofurans by introducing two alkyl groups in 3-C and 5-C of lactol, flash decomposition and hydrogenation.

本文独创新的合成方法：以-乳醇，即-4，10-二氧杂三环[5.2.1.0~(2，6)]-癸-8-烯-3-醇为原料，在其3-位和5-位先反向引入两个取代基，再经过热分解和催化加氢反应，高立体选择性地合成反式-2，5-二取代四氢呋喃。

Monitoring the stock according to above conditions,10 O'clock is the key time,if in the just time ,the stock's price is at comparaed low,and in 1 minuter it be pulled up,we can buy.

密切关注符合以上提交的股票，十点钟是个重要的时间点，如果监视的股票在10点处于相对地点，并且能在1分钟内拉起，则是买入的机会。

Hiroshi Okuda, a nonfamily president who ran the company from 1995 through 1999, has told at least two associates since the recalls of cars involved in sudden acceleration incidents earlier this year:'Akio needs to go.' The 77-year-old remains a key company adviser even though he gave up his board seat last year.

今年早些时候丰田因突然加速问题而召回汽车以来，曾在1995年至1999年担任丰田公司总裁的非丰田家族人士奥田硕对至少两名助手说过，丰田章男必须离开。77岁的奥田硕去年放弃了董事会席位，不过仍是公司主要顾问之一。

Hiroshi Okuda, a nonfamily president who ran the company from 1995 through 1999, has told at least two associates since the recalls of cars involved in sudden acceleration incidents earlier this year:'Akio needs to go.' The 77-year-old remains a key company adviser even though he gave up his board seat last year.

今年早些时候丰田因忽然加速题目而召回汽车以来，曾在1995年至1999年担当丰田公司总裁的非丰田家族人才奥田硕对至少两名助手说过，丰田章男必须离开。77岁的奥田硕往年放弃了董事会席位，不过还是公司住要顾问之一。

This paper builtup esterification model, pre-polycondensation model, polycondensationmodel, and successfully built up monitoringon-line system of some key quality tar gets as well as operation systemmodel according to the polycondensation technique of NOY company.

本文在软测量技术的基础上，建立了酯化反应控制模型、预缩聚反应控制模型、终缩聚反应控制模型，并成功开发出在线控制系统，对生产过程中的关键质量指标如粘度、二甘醇、端羧基进行在线控制，控制精度达到小于2.5％。

It also introduces the key technology of software implementation, discusses how to use Open Graphics Library technology to make up foot orthosis model and implements simulation of the model in detail.

本文简要介绍了OpenGL的应用范围、工作模式、工作原理，提出了以VisualC ++ 6.0为开发平台的基于面向对象的足底矫形器CAD软件设计方案，介绍了软件实现的核心技术，详细论述了足底矫形器的几何造型方式和数据结构，以及OpenGL技术在矫形器模型仿真实现中的应用

The results show that the blacktop performance can be improved efficiently up to existing technical standard if adding properly the reclaiming agent in the outspent asphalt mixture. Some key points are suggested for designing recycled asphalt mixture as blacktop, which may be referable to the design and construction of utilizing recycled asphalt mixture.

结果表明：在旧沥青内添加适宜、适量的再生剂可以有效地改善旧沥青的路用性能，达到规范所规定的技术标准要求；提出了沥青路面混合料再生设计中应该注意的问题，对今后沥青路面的再生设计与施工具有一定的指导意义。

How one enterprise accept advanced theory and turn it into performable practices,then execute quickly,sum up in time,improve continual,build a systemic management system at last,which is the key point of long－life enterprise.

任何理性的行为与活动都有其根本的意图和指导思想，因此，本文首先分析了当今企业生存与发展的环境，在此条件下提出构建系统化管理体系的两个根本指导思想——系统的思想与权变的思想，并以系统理论和权变理论为支撑，对企业系统化管理体系框架作了简单描述。

You can operate Music Plyer function by click "UP" direction key in standby mode and you can enjoy the music in Music Player Function.

- 听音乐 Music Player 在待机状态下的待机界面简单地按上方向键，这是播放音乐的快捷方式；这个音乐播放的特殊按键，可以让使用者轻松地播放喜欢的音乐，不需要开盖来操作。

The experiment studies production craft of millet milk, and how to solve stability , preservability and other key craft parameter of products, then setting up mathematics model between the stablizers;.Studed on the fermented millet milk craft on this basis , we confirm the best matching of the fermentation adjunct through sense organ , physics and chemistry evaluate.

本实验主要研究米奶的生产工艺，并对如何解决产品的稳定性、保藏性等关键工艺参数进行系统的研究，从而对所用稳定剂之间的相互作用建立了数学模型；在此基础上进行发酵米奶工艺的研究，重点进行了发酵剂的优选，通过感官、理化等综合评定，确定了发酵剂的最佳配比。1。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。