您要查找的是不是：
- polished rod head 抛光钻头
- The unit horse head polished rod close to beam suspension gravity working point .Therefore, while pump holddown beam bending moment so small that will not cause beam broken. 本机驴头悬点距游梁吊重力作用点距离很短，所以，卡泵时游梁弯矩小，不足以造成折梁。
- The new assembly can make the joint of the polished rod pass through, therefore can meet the need of new oil production technology. 这种密封盒可以使比光杆杆体直径大得多的光杆接头通过，能满足新的采油工艺需要。
- The polished rod fishing tool is a new type of fishing tool and is mainly used to fish long slim, not heavy rod type fishes. 光杆落物打捞器是一种新型打捞工具,主要用于打捞重量较轻的细长光杆式井下落物(如测斜仪器、测井仪器等),详细介绍了该工具的结构、工作原理及使用注意事项。
- Kinematic parameters of different types of pumping units, including the displacement, velocity and acceleration of the polished rod and the torque factor can be calculated easily and accurately by using this method. 为此，根据几何关系和运动特点，建立了运动学模型，提出了异形游梁式抽油机运动参数的求解方法。
- According to the static and running parameters of rod pumping wells, the methods of simulating dynamometer cards of the polished rod and pump on the basis of wave equation were setup. 摘要根据油井的静态与动态参数，建立了以波动方程为基础的抽油机悬点与泵示功图的计算机仿真模型。
- If any other requirements for piston rod head, U type ring width of cylinder lid, and diameter of pin are needed when placing an order, it is recommended to use our existing forged pieces. 订货的场合，如果对活塞杆头、油缸盖的U形环的宽度、销子的直径等尺寸方面另有要求时，建议采用能够利用的本公司现有的模锻件。
- Effects of Polished Rod Clamps on Polished Rod Fatigue Life 光杆卡对光杆疲劳寿命的影响
- She nestled her head on his shoulder. 她将头依偎在他的肩上。
- Development and application of centralizing polished rod stuffing box 随动对中光杆密封器的研制与应用
- Give the table a good rub with this polish. 用这上光剂把桌子好好擦一擦。
- Diagnosis of the Production System from the Load Borne by the Polished Rod 螺杆泵井光杆受力法工况诊断技术
- The deer lowered its head to drink from the pond. 鹿低下头去喝池塘里的水。
- He gave the little boy a clout on the head. 他在那小男孩的头部打了一下。
- The wavelet transform applied in polished rod acceleration measurement 抽油机悬点加速度测量中的小波变换方法
- I saw the small girl topple over and hit her head. 我看见那小女孩栽了一跤，碰着了头。
- He had polished the table-top until it gleamed. 他把桌面擦得很亮。
- I bought a new fishing rod last Sunday. 上星期日我新买了一个鱼竿。
- He polished off the pie and the fruit. 他很快吃完了馅饼和水果。
- I was dazed by the blow on my head. 我的头挨了一击而觉得晕眩。
