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Three alicyclic dianhydrides, 1,2,3,4-cyclobutanetetracarboxylic dianhydride, 1,2,4,5-cyclopentanetetracarboxylic dianhydride, and 1,2, 4, 5-cydohexane tetracarboxylic dianhydride were polymerized with two aromatic diamines, 1,4-bis (4-amino-2-trifluoromethylphenoxy) benzene (6FAPB, a) and 4, 4'-bis(4-amino-2-trifluoromethyl phenoxy) biphenyl (6FBAB, b) respectively, via a two-step polycondensation procedure to afford two series of fluorinated semi-alicyclic polyimides.

分别将脂环族二酐单体1，2，3，4-环丁烷四酸二酐、1，2，4，5-环戊烷四酸二酐和1，2，4，5-环己烷四酸二酐与芳香族含氟二胺1，4-双（4-胺基-2-三氟甲基苯氧基）苯(6FAPB， a)和4，4'-双（4-胺基-2-三氟甲基苯氧基）联苯(6FBAB， b)反应制备两个系列的含氟半脂环族聚酰亚胺，研究了PI薄膜的热性能和光学性能。

He's not only a three-letter man,he's also a straight A student,you know,one of those All-American types.

他不仅仅代表三个球队，他的学业成绩也都全都是A，你知道，他就是那种人人都想成为的美国理想人物。

METHODS: A retrospective study of outcome of LASIK (Allegretto excimer laser system and Moria C-B microkaretome) for predominant myopic astigmatism (group A, 28 eyes) and normal myopic astigmatism (group B, 30 eyes).

分析LASIK技术（鹰视准分子激光系统和MORIA C－B微型角膜刀）治疗以散光为主眼(A组，28眼)和以近视为主眼(B组，30眼)的术后结果。

It suggested that allele A had a positive effect on the meat production and quality of Langya Chicken.

结果表明：等位基因A对琅琊鸡的肌肉产量和品质具有正效应。

This study was aimed to investigate the molecular genetics basis of a novel allele HLA-A+2459 in Chinese population.

本研究探讨HLA新等位基因HLA-A*2459的分子机制。

A green indicator on the screen means that the normal key set is currently active.A red indicator on the screen means that the alternate key set is currently active.

在屏幕上绿色指示灯是指正常的关键，目前active.A设置在屏幕上的红色指示灯意味着备用键设置当前处于活动状态。

Results Average neurobiotin concentration in the coupled ON cone bipolar cells was lower than that in the coupled AⅡ amacrine cells.

相对于AⅡ-AC 和ON-CB间可能的异源型缝隙连接，NB较易通过AⅡ-AC间的同源型缝隙连接。

Vitamin A not only can synthesize inspect amaranthine qualitative, it is clearer to still can make the eye sees a thing below dark light, accordingly, green tea not only can eliminate computer radiant harm, still can be protected and raise eyesight.

维生素A不但能合成视紫红质，还能使眼睛在暗光下看东西更清楚，因此，绿茶不但能消除电脑辐射的危害，还能保护和提高视力。

A: I am Ra. This is a very ambiguous question.

A ：我是拉。这是一个非常模糊的问题。

Ancient Egyptian sun god with the head of a hawk; a universal creator; he merged with the god Amen as Amen-Ra to become the king of the gods

a。 现成的，(常指廉价的，质量不高的)用旧的，千篇一律的n。现成的衣服，旧东西，二手货 reachn。延伸，范围，河段v。到达，伸出，延伸

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐