等轴

objective: to evaluate the clinical application of helical ct for the location or treatment of maxilla embedded tooth in the dental orthopaedics.method: 18 cases with embedded tooth of maxilla were made with clinical examination, dentomaxillary pantomography, submaxilla lateral projection and helical ct.the operation be done for supernumerary tooth,distorted teeth,inverted tooth.three embedded tooth of non-inverted tooth were done by orthopaedics.result: among the 18 embedded tooth ,there were 11 palatally and 6 labially presented teeth,1 the 18 patients is mediately with completely inverted supernumerary tooth.all preoperative assessment are one and all in operative or orthopaedics and primary wound healing.

四川大学华西口腔医学院正畸科，四川成都 610041摘要：目的：正畸治疗中对上颌埋伏牙如何定性，定位，并要对此是采取手术拔除［1］或者是正畸治疗进行探讨。方法：对18例（其中1例为2颗多生牙，1颗多生牙已长出，另一颗为完全倒置的多生牙），上颌前部埋伏牙采用临床检查以及拍摄全景片、头侧位片螺旋ct轴位和表面成像等检查［2～4］对埋伏的多生牙、畸形牙和倒置牙共15例采用了相应的手术进路拔除，对形态正常且不倒置的3颗埋伏牙采用了正畸治疗。

Secondly, the simulative software has been made using MATLAB to simulate the suspensory point load、 velocity、 acceleration and pure toque of speed reducer shaft of pumping unit on any place and the displacement、 velocity、 acceleration of main component of pumping unit and the forces of linked point of two components, so the changes of the motion and the force of pumping unit and the geometry parameters' influence on the main performances of pumping unit have been dynamic analyzed.

其次，利用MATLAB，编制了仿真软什，对抽油机在任意位置时的悬点载荷、速度、加速度和减速器输出轴抓矩以及抽油机主要构件的位移、速度、加速度利各构件连接点的受力等进行了仿真，从而动态地分析了抽油机的运动利受力变化及几何参数对抽油机主要性能的影响情况。

Firstly, the detailed analysis and calculate of the dynamics parameters as suspensory point load, pure toque of speed reducer shaft etc and kinematics parameters of conventional beam-pumping unit and eccentric placed pumping unit which are in services in oil field have been made combining the basic theory of present beam-pumping unit to provide theoretic foundation for the kinematics and dynamics simulation and optimizing design of pumping unit.

首先，结合现有游梁式抽油机工作原理，对油田在役的常规型游梁式抽油机和异相曲柄平衡游梁式抽油机的运动学和悬点载荷、减速箱曲柄轴静扭矩等动力学参数进行了详尽的分析计算，为游梁式抽油机的运动学和动力学仿真及其优化设计提供了理论依据。

Its high speed is between 4000-500 stitch per minute.It adopts the designs of cam controlled swing needle bar,eccentric hook shaft compensation mechanism,hanging thread link feed mechanism,turing takeup lever,oil pump suto lubrication mechanism.

其最高缝速在4000-5000针/MIN之间，在结构上采用凸轮机构控制针杆摆动、偏心旋梭轴补偿机构、悬结式连杆送料机构、旋转式桃线、螺旋油泵自动润滑系统等设计。

Therefore,it is necessary for us to conduct a series of principle analysis on different sections of the station such as the fuel system,lube system and cooling system of the diesel engine for generators,and the shaft generator as well as the main switchboard etc. It is also important to carry out at meantime a number of reliability tests and analyze the test results so as to assure all the units of the station will run smoothly.

因此，我们通过对船舶电站中柴油机的供油系统、润滑系统、冷却系统、轴带发电机、主配电板等各个环节从原理上进行分析，并进行必要的可靠性试验，对试验数据进行分析，确保船舶电站各个环节的运行良好。

The mechanics parameters of marble, upper lherzolite, down lherzolite, granite and ore were tested by uniaxial compression testing and relaxation method of double torsion constant displacement load using Instron1342 type electro hydraulic servo test machine.

利用Instron1342型电液伺服材料试验机，采用单轴压缩试验和双扭常位移松弛试验对大理岩、上盘二辉橄榄岩、下盘二辉橄榄岩、矿石、混合岩5组岩石的试件进行力学参数测试，获得相应的抗压强度、Ⅰ型断裂韧度等试验数据。

It is found that the shear stress in the torsional bar is much higher than that in the main shaft except blowing operation.

发现了除吹炼工况外扭力杆剪应力明显高于耳轴剪应力等现象。

The mean, maximum and minimum value of the area of transverse section and the major axis length of ellipse and the maximum centroid displacement can be used to discriminate width of pulse tracing.

长轴长度周期平均值、最大值、最小值，面积周期平均值、最大值、最小值，以及轴心在平行于皮肤表面的最大位移等参数可以作为初步判别脉宽的参数。

Methods Men 50 health Chinese people accepted EBCT common transverse and short axis enhanced movie scan(27 men, 23 women, average age 47.7 years.).

方法50例健康人（男27例，女23例，平均年龄47.7岁），利用EBCT横断和心脏短轴电影扫描，分别测量主动脉、肺动脉、左心房和左心室径线，以及左心室心肌厚度、心肌增厚率等；利用心功能分析软件，计算左、右心室各功能指标。

Trunnion bearing is rolling bearing with low speed and high load, if faults such as point erosion, peeling and roller fragmentation, happen in the manufacture process, it will bring vast economic losses, and will take much time and costs to maintain it.

耳轴轴承为低速重载滚动轴承，在其运行过程中一旦发生局部点蚀、剥落以及滚动体破碎等故障，会引起较大的经济损失，而对其进行检修往往要花费大量的时间和费用。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。