有螺环的

Considered the inside and outside contour line was Archimedes spiral in the cold rolling, the forming law of rectangular cross sectional rings has been studied. And the more precise geometrical models and calculation models have been gained. The researches can be used as a theoretical and experimental foundation for the simulation of ring rolling process. At the same time, the results of theoretical analysis have a good agreement with the results of practical rolling production.

本文在考虑冷轧过程中环件的内外轮廓线均为阿基米德螺线的情况下，对矩形截面环件的轧制成形规律进行了研究，得到了较精确的几何模型和计算模型，为环件轧制过程的模拟提供了理论依据和实验依据，同时理论分析的结果与实际轧制生产过程中的结果有较好的吻合。

The molecular structure of 9,9 '-spiral Spirobifluorene has a very characteristic , which has two planar aromatic structure .they were connected through the only carbon atom and form the mutually perpendicular and structural stability of the cross-plane.

9，9'-螺双芴的分子结构非常有特点，两个具有平面结构的芳香环，通过唯一的碳原子连接构成相互垂直、结构稳定交叉平面。

I tried put an O-ring on the barrel screw section, end up when we close the cap we got smooth and soft feeling.

今天试著在笔管螺牙处装上一 O环，结果锁上笔盖时就很有QQ的感觉，不错！

The recent progress in electroluminescence device including spiro compounds of fluorene and anthracene is discussed in this paper. The synthetic methods of double-spiro and single-spiro organic compounds together with EL devices are described in detail.

对近年来含芴、蒽螺环结构发光材料的研究进展进行了总结，重点介绍了含有双螺、单螺结构的有机电致发光材料的结构和特性，给出了部分有机化合物的合成方法。

It was also found that the electron-donating groups in the 5-position of indoline moiety could stabilize the colored forms and then low the thermal decay date.

吲哚啉环上5位的取代基对螺噁嗪热消色过程也有影响。5位的给电子基团能稳定开环体，热消色速率降低，寿命延长。

From its roots, we gained 9 compounds including triterpenes, steroidal glycoside, and fatty acid, a triterpene and a of them are new compounds.

分别对肥牛树的根、茎、叶三个部分的乙醇提取物进行了提取分离工作，从其根中分离鉴定了9个化合物，包括三萜、甾醇苷、酚性化合物、螺环化合物和脂肪酸等，其中有两个新化合物，即一个三萜和一个螺环化合物。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。