引入

The results show that the incorporation of noncoplanar structure led by the introducing alkyl substituents on fluorenyl cardo diamines improves the solubility of cardo polyimides in organic solvents without sacrificing thermal properties.

结果表明，通过在芴基Cardo二胺引入烷基取代基而形成非共平面结构能改善聚酰亚胺的溶解性，而不牺牲热性能。2。

The results show that the introduction of fluorenyt cardo groups can;a.evidently increase Tg;b.partly improve the solubility but the effect is not outstanding;c.not decrease thermal stability;d.not decrease mechanical properties when the molar content of cardo group is low.

结果表明Cardo结构的引入可以；a。明显提高Tg；b。部分改善溶解性，但效果不明显；c。不降低热稳定性；d。当Cardo基团的摩尔含量较低时，不降低力学性能。5。

4A series of random copolyimides with fluorenyl cardo structure was synthesized by the introduction of fluorenyl cardo groups into the backbone of polyimides with lower Tg—YS-20,YS-30 and Ultem respectively.

通过在Tg较低的YS-20，YS-30及Ultem等聚酰亚胺中主链上引入Cardo基团，合成了一系列含芴基Cardo结构的无规共聚聚酰亚胺。

The flower was introduced in Western Europe and the Netherlands in the 17th century by Carolus Clusius, a famous biologist from Vienna.

17世纪时，一位著名的维也纳生物学家卡罗拉斯·克鲁休斯把郁金香引入西欧和荷兰。

At the same time, the signal system of the implementation process will be the introduction of a corporate entity to carry out domestic signal system's core technology standardization and industrialization, and ultimately the formation of the track signal system made the core of the industrial chain.

同时，在信号系统实施过程中将引入企业实体，开展国产信号系统的核心技术的标准化和产业化工作，最终形成国产轨道信号系统的核心产业链。

To ameliorate the field of view Cassegrain optical system, a diffractive optical element is successfully introduced to the system and the design scheme is provided in this paper.

为了改善卡塞格林光学系统的视场，将衍射透镜成功地引入大视场卡塞格林光学系统的设计中，并给出了设计方案。

To ameliorate the field of view of Cassegrain optical system,a diffractive optical element is first successfully introduced to the Cassegrain optical system and the design scheme is provided in this paper.

为了改善卡赛格林光学系统的视场，首次将衍射透镜成功地引入大视场卡赛格林光学系统的设计中并给出了设计方案。

These models come in a variety of colors and made from either cast iron or steel.

这些模型引入了很多颜色，这些颜色是由生铁和刚中获取的。

A hybrid fast genetic algorithm (H2O) is proposed on the basis of various characteristics of nature evolution. This algorithm is combined with niche technician, a variety of crossover schemes, multi-populations and catastrophism phenomenons.

为了有效地克服非线性、多参数、多极值的组合优化问题中遗传算法的早熟收敛现象，引入生物的小生境技术和自然界生物多种杂交方式并存、多个子群体并行以及灾变现象而提出了一种综合的快速基因搜索策略。

We know that the latter selected their subject-matter and disposed of it each in his own way, and with a special end in view, but this matter was the same for all three, at least for the whole contents of the pericopes, and was taken from the original catechesis, which was already sufficiently well established not to admit of the introduction into it of new ideas and unknown facts.

我们知道，他们的选择，后者的主题事项和处置每次在他自己的方式，并有特殊目的，但这个问题是相同的所有三个，至少在整个内容pericopes ，是采取从原来的理，这是已经充分确定的不承认它的引入新的思想和未知的事实。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。