梯形

The stem factor used to convert thrust to torque is a function of the acme thread characteristics of the valve stem and drive nut.

用来将推力转换成扭矩的阀杆系数是阀杆和驱动螺母上的梯形螺纹的函数。

Shouldered nuts ; metric fine thread , rounded acme thread

带肩螺母。米制细牙螺纹。圆的梯形螺纹

The elements are also used to get the section polygons of such composite surfaces as the whole aircraft at a given body station, then a section area is approximated with the sum of trapezoidal areas between such sides of polygons that are not covered by any other component and a reference axis.

离散出的面元还被用于求取全机这样的组合曲面在某一站位处的横剖面多边形，而横截面积则用累积多边形不被其他任意部件遮挡的各边与参考轴间的梯形面积予以近似。

The calculating model of soil pressure of anchor bar supporting structure commended by the code named "technical code for building slope engineering" is reasonably chosen.

这经实践证明并不十分妥当，文中选用目前《建筑边坡工程技术规范》所建议的锚杆支挡结构的土压力计算模型，即认为土压力的分布形状为梯形。

In view of the problems occurring in trapezoidal support used in coal seam gateway, a novel small-curvature arch support for mining engineering is presented.

摘要针对煤层顺槽梯形支架存在的问题，提出一种新型结构的小曲率拱型支架。

Results: The growth of NB4 cells was inhibited significantly after treated with berbamine at different concentrations for different time points, the IC50 value was 3.860μg/ml at 48 hours. Morphology analysis showed the characteristics of apoptosis, and the DNA agarose electrophoresis showed the typical DNA ladder. The apoptosis rate increased from 2.83% to 58.44% after treated with berbamine at 12μg/ml for 18 hours. The expression of PML-RARα mRNA presented no significant changes, however, Survivin mRNA was decreased dramatically.

结果：经不同浓度小檗胺处理不同时间后，NB4细胞生长出现明显的抑制，并呈现明显的时间剂量依赖性，48h IC50为3.860μg/ml；细胞形态学观察可见细胞凋亡现象，DNA琼脂糖电泳显示典型的凋亡梯形图：流式细胞仪检测发现细胞凋亡率明显增加，经48h作用后，凋亡率从2.83%增至12μg/ml时的58.44%；虽未发现药物作用后PML/RARα基因表达量的改变，但检测到NB4细胞经药物作用后Survivin基因表达量的减少和Caspase3表达的增加，Caspse3阳性率从对照组的2.06%增至12μg/ml时的70.89%。

The two threading lines could process round thread, buttress thread, premium connection, and so on.

两条车丝线可加工圆螺纹、偏梯形螺纹、特殊螺纹等。

The finite element models for contact problems of connectors of buttress and round thread s of casing are established with the elasto-plastic FEM.

用弹塑性有限元法建立了套管偏梯形和圆形螺纹接头接触问题的有限元力学模型。

Short round thread, L -- Long round thread, B -- Buttress thread.

——短圆螺纹； L ——长圆螺纹； B ——偏梯形螺纹。

The article indicates the characteristics of buttress thread compared with round thread and analyzes the defect caused by materials size of API and 5CT plane tube.

文章通过分析指出，偏梯形螺纹有比圆螺纹更具优势的特点，也因此在使用符合API 5CT要求的套管原料进行生产时，由于平端套管原料管子尺寸精度原因而更易产生缺陷，通过理论计算和现场实测，提出了合适的偏差范围。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。