有三齿的

The main work of this paper includes:① The calculation of the structure parameters and 3D modeling in I-DEAS of the crown gear coupling are carried on.

本文的主要研究内容有：①对鼓形齿联轴器进行结构尺寸设计计算，应用I-DEAS 软件对鼓形齿联轴器进行三维实体造型。

Leaves crowded near apex of the trunk, spirally arranged; stipes dark brown, with sharp spines; lamina large, oblong, tripinnate; pinnae 17-20 pairs, alternate, longest one to 60 cm long, the basal one reduced; rachis short-spiny; pinnules 18-20 pairs, sessile or nearly so, lanceolate, to 10 cm long and 2.5 cm wide, divided almost to the costa; segments more or less falcate, toothed.

叶螺旋状排列，聚生於茎端；叶柄棕色，具锐刺；叶片大，长矩圆形，三回羽状深裂；羽片17-20对，互生，最大的长达60厘米，基部一对缩短，羽轴有短刺；小羽片18-20对，无柄或近於无柄，披针形，长达10厘米，宽2.5厘米，深裂几达中脉；末回裂片多少镰状，有齿。

Sixteen ( 15 new) amphibian and twenty-two ( 11 new) squamate species have been reported across China, including the oldest Chinese tetrapod Sinostega pani from the Late Devonian of Ningxia Hui Autonomous Region, the large stereospondyl amphibian Yuanansuchus laticeps from the Middle Triassic of Hubei Province, Late Jurassic/Early Cretaceous lissamphibians ( e. G., the anurans Callobatrachus sanyanensis and Mesophryne beipiaoensis, the caudates Jeholotriton paradoxus and Laccotriton subsolanus) from Northeast China, Paleogene lizards (e. G., Brevidensilacerta xichuanensis and Tinosaurus yuanquensis) from North China, and numerous lizards from the Late Cretaceous of Nei Mongol Autonomous Region.

共报道了16种两栖类和22种有鳞类，其中15种两栖类和11种有鳞类为新种，包括我国最古老的四足动物宁夏晚泥盆世的潘氏中国螈，湖北中三叠世的大型全椎两栖类宽头远安鲵，东北晚侏罗世/早白垩世的多种滑体两栖类(如无尾类三燕丽蟾和北票中蟾，有尾类奇异热河螈和东方塘螈)，华北古近纪的蜥蜴类(如淅川短齿蜥和垣曲响蜥)，以及内蒙古晚白垩世的多种蜥蜴类等。

Results showed there were no marked distinction (P＞0. 05) bewteen left and right side. One out of fieds in the hippocampus cortex had marked distinction (0.01＜P＜0. 05), CA1 and subiculum＞CA2 and CA3＞CA4 and dentate gyrus.

结果表明，四个年龄组的左右侧毛细血管比容积，均无明显差异(P＞0.05)，海马皮质三个区域之间的毛细血管比容积，有明显差异(0.01＜P＜0.05)，Cal 区和下托区＞CA4 区和齿状回＞CA2 和 CA3 区。

The main products are selling all kinds of ball joint assembly, straight drawbars assembly, the arm assembly, flywheel ring gear, metal handle of the door, the shaft sleeve, such as Jack more than 30 varieties, Models widely applied throughout the country, with the market-and enjoy high reputation, the products have been sold to over 20 provinces, municipalities and autonomous regions.

主要产品有各种球销接头总成、直拉杆总成、支臂总成、飞轮齿圈、外门金属拉手、中轴衬套、千斤顶等三十余个品种，适用车型广泛，在全国微配市场上享有较高的声誉，产品已销往全国二十多个省、市、自治区。

In the structural design Unique scroll crushing chamber and P, S, T three broken, rotor system adopts the key sets of cone connection, efficient hammer wear-resistant plate, insert the installation form, tilt housings, the unique profile counterattack liner, multi-rack Position open the door, screw or hydraulic device to open the replacement of wearing parts, maintenance more convenient.

在结构上设计有独特涡旋破碎腔和P、S、T三段破碎区，转子体系采用无键锥套联接，高效耐磨板锤，插入安装形式，倾斜轴承座，独特的齿形反击衬板，机架多方位开门，丝杠或液压开启装置使更换易损件、检修更加方便。

By now, the honeycomb seal, brush seal and finger seal are three kinds of the most prospective seals.

目前，除了梳齿密封外，蜂窝密封、刷式密封及指尖密封是三种最有前景的密封。

Within 30 months, small recognizable tooth crowns, containing complete bone-like dentin, a well-defined pulp chamber and even enamel, had formed

三十个月内就形成小小但已可辨识的齿冠，有完整的像骨头的齿骨质层，一个非常明显、确定的牙髓槽，甚至珐琅质。

Within30 months, small recognizable tooth crowns, containing complete bone-like dentin , a well-defined pulp chamber and even enamel, had formed.

三十个月内就形成小小但已可辨识的齿冠，有完整的像骨头的齿骨质层，一个非常明显、定的牙髓槽，甚至珐琅质。

The factory was established in 2003, in this short period of three years in the production of the products have been a number of companies praised the agreement, the development of today have a variety of equipment such as: hobbing machine, slotting machine, CNC lathes and milling machines.

本厂成立于2003年，在这短短的三年时间里生产的产品已经得到多家公司一致的好评，发展到今天已有多种设备如：滚齿机、插齿机、数控车床和铣床。

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。