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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。

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。

There are a tens of flash orthographical shadow photograph points which are the main test equipments in the ballistic tange of the flight line.

实验表明，同一照相站两个火花闪光源内光的不同步时间约可在3μs，这给测量结果带来了不容忽视的误差。因而，改善正交闪光阴影照相的同步性能是十分重要的课题。

Herein, a series of compounds, BP-C〓-NBD (n=2, 3, 4, 5, 6, 8, 10), was synthesized. Nanosecond flash photolysis, phosphorescence emission and lifetime, as well as photoisomerization reaction of norbornadiene were used to understand the intramolecular triplet energy transfer in detail.

我们设计、合成了以多亚甲基连接的二苯酮与降冰片二烯（BP-C〓-NBD，n=2，3，4，5，6，8，10）系列化合物，利用纳秒时间分辨技术、低温磷光发射、磷光寿命以及光敏异构化的方法，对其分子内三重态能量传递过程进行了详细地研究。

Because its a retainable, bio-degradative and innoxious energy resource with high flash point, it aroused worldwide interest. In this research, alkali-catalysis and acid-catalysis were applied to prepare biodiesel from palm oils and palmitic acids respectively.

由于生物柴油各项性质与石化柴油极为相似，可以作为石化柴油的替代品，具有可再生、可降解、无毒、高闪点、对环境友好等优点，已引起许多国家广泛重视。

For example, if I am shooting indoors where my flash is my dominant light source, I'll most likely be shooting at 400 ISO or thereabouts, and using a slowish shutter speed to get some ambient light in ..

事先做好估计非常重要，比如，我要在室内摄影以闪灯作为主光源，此时我就会想到应该采用大约 400 的 iso，使用较慢的快门来保留环境光，比如大约 1/40 秒。

Kobe Bryant with all the flash in his game, has honed his fundamental skills to a tee.

科比拥有扎实的基本功，从球的处理到罚球都使他的比赛充满了闪光点。

The aim of this article is to explain why Flash intros are a very bad thing in terms of design, usability and search engine visibility.

原因是你的系统在最近升级更新过了，并且安装了更新系统编号为KB912945的补丁。

A yellow light on the dash- board flash ed angrily Bruce cheerfully announced that there was no oil in the engine!

仪表盘一盏黄灯闪着刺眼的光芒，布鲁斯兴致勃勃地宣布发动机里没油了！

FLASH FLOOD \ 一片汪洋 A person waded through waist-deep water in Coffs Harbour, Australia, Wednesday.

周三，一个人在澳大利亚考夫斯港齐腰深的水中艰难行进。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。