梯形螺纹

Stability of implants was measured by rfa regularly.results there was no significant difference between both groups about stability at all periods and histomorphometry, but isq, bic and ba of experimental group were higher than control group, and isq recovered more quickly in experimental group after loaded.conclusion dual threads design contributes to assure the initial and secondary stability of implants, which is particularly important in poor density bone.

结果 两组种植体在各时期的稳定度差异均无显著性，但在每一时期实验组种植体的稳定度均较对照组高，实验组种植体在负重后稳定度恢复较快，负重3个月后实验组的骨-种植体接触率和种植体周围骨面积均较对照组稍高，但两者差异无显著性。结论双梯形螺纹种植体有利于保证种植体的初期和后期稳定性，应用于低密度骨质优越性会更加明显。

The performance of trapeziform labyrinth screw pump was investigated by changing geometric parameters of trapeziform screw.

分析了梯形螺纹几何参数对迷宫泵性能的影响。

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 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。

The main products are: thread cutting tools: the machine tap, pipe thread tap, nut tap, tap spiral groove, spiral pointed tap tap ladder, hand tap, tap extrusion, screw tap sets, L-tap, tap straight groove, roll teeth as well as increase the tap tap, tap lengthened and undertake kinds of non-standard and special-shaped screw instrument.

主要产品为：螺纹刀具：各机用丝锥、管螺纹丝锥、螺母丝锥、螺旋槽丝锥、螺尖丝锥梯形丝锥、手用丝锥、挤压丝锥、螺套丝锥、左旋丝锥、直槽丝锥、滚牙丝锥以及各种加大丝锥、加长丝锥，并承接各种非标及异型螺纹工具。

Finite element dynamic mode is established for API casing leaning thread contact by using elasticand plastic infinite element.

用弹塑性有限元法，建立了API套管偏梯形螺纹接头接触问题的有限元力学模型。

In the training of students making echelon screw thread by turning,the choosing and grinding of knife,putting knife into nip,putting workpiece into nip should be noticed;the lathe,choice of technics parameter,establishment of working steps should be adjusted.

在训练学生车削梯形螺纹时，要注意车刀的选择与刃磨、车刀的装夹、工件的装夹，要调整车床、选择工艺参数、确定工步。

The grease should be laid on the periphery of seal ring, the inner of ladder-shaped screw thread and chuck ring oil channel during installation.

安装时应将橡胶密封圈四周，梯形螺纹内，压环油槽内，中心管外径上涂黄油。

The grease should be laid on the periphery of seal ring, the inner of ladder-shaped screw theread and chuck ring oil channel during installation.

安装时应将橡胶密封圈四周，梯形螺纹内，压环油槽内，中心管外径上涂黄油。

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。