中杆

In order to know the cause of the accidents, an investigation is taken and the failure analysis is carried out for one broken drill pipe.

为了搞清钻杆断裂原因，对空气钻井过程中钻具断裂事故进行了调查研究，并对一根断裂钻杆进行了失效分析。

On the basis of introducing the construction techniques and quality control of anchor-pole supporting technology in deep foundation pit excavation engineering,it is proved by field test that anchor-pole supporting in foundation pit is reasonable and economical,meanwhile,using suspended net gunite can ensure the stability of the soil among piles,so the technique is worth spreading.

在介绍锚杆支护技术在深基坑开挖工程中的施工工艺及质量控制的基础上，通过现场测试说明用锚杆作基坑支护既经济又合理，同时，挂网喷浆还能解决桩间土的稳定问题，是一项值得推广的技术措施。

In addition, the radius of gyration and cross sectional stiffness of tubular steel are larger than that of angled steels, resulting in better stability.

因此，在三沪直流大跨越工程中，选择了钢管塔结构，塔身腹杆采用刚性腹杆，在塔头与塔身连接处设置水平横隔面。

The overcutting on tool end is checked via comparing the tool radius with the circumradius or the radius of inscribed circle, and the touch interference of tool body based on the symbol of the vector distance from the triangle vertex to the tangent plane of tool body column.

在曲面加工的无干涉路径规划中，通过恰当选择刀具初始位置避免了接触点处的曲率干涉；通过比较刀具半径与曲面上三角片外接园半径的大小即可判断刀具底面干涉；而根据三角片顶点与刀杆切平面的有向距离的正负来判断刀杆碰撞干涉。

Its sclerocorneal muscle and ciliary muscle are flourishing,which cause its ability of double-regulating developed.The iritis sphincter and pupil enlarging muscle can regulate the size of the pupil quickly.There are rods and cones cells in Long-eared owl's retina.The dominant part of the visual cell is the rode cell and the neuromere cell being less that make its eyes high photosensistive.

巩膜角膜肌、睫状肌发达，使其具有很强的双重调节能力；虹膜括约肌、瞳孔放大肌能迅速调节瞳孔大小；视网膜中视细胞由视杆细胞和视锥细胞组成，以视杆细胞占据绝对优势，而神经节细胞较少，从而使其光敏度提高。

To develop theory of bolt support, anchoring mechanism of bolt in jointed rock is analyzed.

为了进一步发展锚杆支护理论，着重分析了锚杆在节理岩体中的加固作用。

Here, we show that several maternally derived germ P granule components are selectively eliminated by autophagy in somatic cells during C.

研究人员以秀丽隐杆线虫为模型，在秀丽隐性杆线虫胚胎发生期，未分化的体细胞中含有来自母体的 P 颗粒的部分蛋白被自体吞噬作用清除掉。

In all designs, the valve stem normally serves as a piston rod with disc fastened directly to them.

在所有的结构中，阀杆通常相当于活塞杆，并将阀瓣直接固定在阀杆上面。

It is used to solve the rod string optimal design issue of the rod pump system.

介绍了MATLAB优化工具箱及其算法的原理和过程，并将其应用于求解有杆抽油系统杆柱组合优化设计问题中。

With the model, torque change in both the pump and pumping rod along the wellbore could be obtained.

利用该模型可获得井筒中任意部位及螺杆泵处抽油杆扭矩的变化情况。

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