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Basing on the computing model of liquid viscous resistance of the sucker rod string, damping coefficient of power law flow for sucker rod string is created, using the condition of equivalent merit. Mathematics model and emulate model of the vibration of sucker rod sting are established.

以幂律流抽油杆柱液体粘滞阻力的计算模型为基础，并应用等功条件提出了幂律流条件下抽油杆柱阻尼系数的计算方法，并依此建立了聚驱抽油杆柱轴向振动的数学模型和仿真模型。

Materials and Methods: 41 cases of fibrous tumors surgically and pathologically proven (fibroma 5 cases and fibrosarcoma 3 cases, neurofibroma 7 cases, malignant neurofibroma 1 case, angiofibroma 20 cases and ossifying fibrom 6 cases) were studied with retrospective analysis.

CT扫描采用轴位，层厚及间隔 5mm ，部分病例用静脉团注增强后扫描，测量增强前后肿瘤的平均CT值。结果：4种良性肿瘤的不同病理改变决定了各自不同的CT特征，它们在好发部位、病变大小、形态、钙化、增强等均有不同。

The results show that upper bainite of 9Cr2Mo Steel and GCr15 steel is feathery and the upper bainite carbide is lamellar or claviform. The upper bainite carbide distributes between the subunits of bainite ferrites by and large parallelly to the axis of bainite ferrites. Lower bainite of 9Cr2Mo Steel and GCr15 steel is in bamboo leaf shape and the lower bainite carbide is in shred or fibre shape. The lower bainite carbide distributes between the bainite ferrites, furthermore, the angles between lower bainite carbonide and the principal axis of the lower bainite ferrites are unequal.

结果表明，9Cr2Mo钢和GCr15钢的上贝氏体组织呈羽毛状，上贝氏体碳化物呈长短不一的薄片状或短棒状，分布在铁素体亚片条或亚单元之间，其排列与贝氏体铁素体片条轴向大体上平行分布；下贝氏体组织呈竹叶状或针状，下贝氏体碳化物呈细片状或纤维状等形状，分布在铁素体片中间，大多数与片条的主轴方向交角排列，但角度不等。

A clamping design approach for automated fixture design based on dowel-pin system is presented in this paper, which accepts a polygonal and columniform description of the part silhouette.

本文提出了基于孔系组合夹具的零件夹紧方案的自动设计方法，适用于由平面和圆柱面组成的工件在三轴加工中心等机床上的钻铣加工工艺。

The factors such as axial pressure ratio, hooped ratio, steel ratio and so on, which affect the ductility of steel reinforcement high-strength concrete short columns, are analyzed. The relative curves between factors and ductility are obtained.

分析了剪跨比、轴压力系数、配箍率等因素对抗剪强承载力的影响，得出了基于累加强度法的钢骨高强混凝土短柱抗剪承载力的计算公式，计算结果与试验值吻合较好。

A new solution is put forward for the irrecognizability of transformer stable state circuit equation model. Simulation and test indicate the method rational and effective.

电力变压器绕组变形是指在电动力和机械力的作用下，绕组的尺寸和形状发生不可逆的变化，包括轴向和径向尺寸的变化、器身位移、绕组扭曲、鼓包、匝间短路等。

Descovered by microsurey, the small bulb formed by level cells which originate from scales by cutting is external origination. The level cells forms unrules large towers.whith have mound shapes, strick shapes and lobate shapes etc.

显微观察发现，小鳞茎的形成直接起源于扦插鳞片切口端近轴面的表层细胞，是外起源的，表层细胞分裂形成不规则的巨型突起，有丘状、棒状、叶状等。

Aimed at the over proof problem of dissolved oxygen in condensation water for 300 MW units, a great deal of tests have been made, this paper deals with the effects of feed water pump sealing water, seal steam heater drain water, overcool degree of condensation water , and condenser makeup water, and puts forward some effective improving measures.

针对某电厂300MW机组凝结水溶氧超标的问题，进行了大量的试验研究，提出了给水泵密封水、轴加疏水、凝结水过冷度以及凝汽器补水等对凝结水溶氧量的影响，并对此提出了一些行之有效的改进措施。

In this paper ,move ment pri nci ple of rocket i n direction pi pe was got by dy— namic si mulation ,and effect characteristic consideri ng contact stiffness ,detent force and nozzle thrust misalignment a— bout pitchi ng angle velocity was analysis .All the study set foundationfor further study of high—lowpressure launch sys— te m.

通 过发射仿真分析，获得了火箭弹在高低压发射系统中的内弹道变化规律，分析了火箭弹与定向器的接触刚度、耳轴扭转刚度、尾喷管推力偏心等因素对俯仰角速度的影响特性，所得结论为火箭武器高低压发射系统的进一步相关研究奠定了基础。

In order to obtain the order of reaction between propanone and iodine, colorimeter sensor can be used. The variation of transmittance and absorbance can be fed into the computer. The statistics wizard of the software can perform linear fitting of the data. The order of reaction can then be calculated through the manipulation of the line slope and y-intercept. Download Teachers' Notes

至於研究丙酮与碘的反应级数方面，则可利用比色计感应器，反应时混合物的吸光度和透射比数据均可传送到电脑，利用软件所提供的统计精灵更可以把数据进行图线分析，从所得的直线斜率和Y轴截距等有关资料便可计算出反应级数。

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