查询词典 drill block

Based on the existing 3-D mechanical equation of drill string, considering the influence of lateral shearing strength and shearing strain on flexural deflection of drill string, the universal basic equations for the shearing deformation of drill string are established according to the deformation and force characteristics of the drill string.

该公式综合描述了横向剪切变形和轴向钻压对钻柱横向振动固有频率的影响，是对现有钻柱力学基础理论的补充和完

Qun drill or multifacet drill is an advanced drill type, which was invented in China in 1953 from the modification of the conventional twist drill.

群钻是五十年代发明的一种先进钻型，其寿命比普通麻花钻提高2～5倍，轴向力减小30～50％，拒矩减小10～30％。

Abstract］ objective to explore the accuracy and safety of safety drillprepared for cervical pedicle screw trajectory.methods fourteen adult cadaver specimens of cervical spine（c3～c7）with intact structures including ligaments and perivertebral muscles were reserved and used.according to the radiographic measurements,safety drill was inserted into cervical pedicle individually.the evaluation of the drill's trajectory was carried out by ct scan and three-dimension reconstruction and autopsy.results one hundred and forty drill's trajectories were made.9 holes failed with a perforation rate of 6.4%.conclusion the safety drill prepared for cervical pedicle screw hole is safe and effective and can be applied and popularized clinically.

目的 探索安全钻头应用于颈椎弓根螺钉孔道钻探的安全性与准确性。方法随机取14具福尔马林浸泡的成人颈椎标本（c3～c7），保留完整的脊柱三柱结构及相关的韧带和椎旁肌，根据影像学测量的进钉点和进钉方向，模拟颈椎后路手术过程。选用安全钻头，进行实际的颈椎弓根螺钉孔道的钻探，将孔道行ct扫描，并斜位三维重建孔道形态，并以肉眼直视观察结果为金标准，评价孔道钻探的成败。结果钻探孔道准确率89.3%（125/140），穿孔率6.4%（9/140）。结论安全钻头应用于颈椎弓根螺钉孔道钻探的安全性与准确性均较高，可以在临床上推广使用。

Auger bit, square shank drill bit, electrical, hammer drill bit, masonry drill bit, flat wood bit, forstner drill lok, chisel.

8A79 8A81 自螺钻、万孔钻、冲击钻头、电锤钻头、木工扁钻、木工绞孔钻、门锁套装开孔器、调节圆孔钻、凿子。

To get the best drill auger, a set of model drill auger and related test device were designed and manufactured. By choosing appropriate material as boring medium, a series of model test of drill auger boring into cement soil were done to study the impact of pattern of the drill auger and the screw-pitch on the holeforming torque.

为得到最优的螺旋挤扩钻头型式，设计加工了不同型式的模型钻头及相关试验装置，并选择合适的材料作为钻入介质，通过不同型式模型钻头的钻入试验，研究了钻头螺距、螺纹形状等参数对钻头成孔扭矩的影响。

Danyang Century Mingrui Tools CO., Ltd mainly specializes in the production of various tooling products, such as tct saw blade, diamond saw blade, hss twist drill bits, hole saw, wood flat drill bits, masonry drill bits, wood auger bits and hammer drill bits etc.

丹阳市世纪明瑞工具有限公司主要从事生产各种模具产品，如TCL通讯锯片，金刚石锯片，高速钢麻花钻钻头，开孔器，木材单位钻头，石工钻头，螺旋钻头和木锤钻头等

Rotary hammer, cordless driver drill, electric drill, marble cutter, angle grinder, trimmer, die grinder, diamond core drill, engineer drill.

1G82 电锤，充电式电钻，电钻，石材切割机，角向磨光机，修边机，电磨，金刚石钻孔机，磁座钻。

The new structure and the county, Hebei Province China Pile Driving Machinery Factory, factory has 30 years, the company developed and produced a series of Piling Machinery total of 10 series over 30 varieties, mainly KQ series of submersible Drilling Rig, KLB walker hydraulic auger drilling rig, DZB multi-rig, CFG series pile driver, car rigs, reverse circulation drill, spiral pile driver, hydraulic walking rig, gravel pumps, drilling and engineering products and related accessories (pipe, drill pipe, drill pipe, drill bit, seal apron);.

简介： 华构牌反循环钻机效率good，反循环钻机；河北省新河县华构桩工机械厂。河北省新和县华构桩工机械厂，建厂已有三十多年，公司研制生产的系列桩工机械共有10大系列30多个品种，主要有KQ系列潜水工程钻机、KLB液压步履式长螺旋钻机、DZB多功能钻机、CFG系列桩机、汽车钻机、反循环钻机、螺旋桩机、液压步履钻机、砂石泵、工程等产品及相关钻机配件（导管、钻机导管、钻杆、钻头、密封胶圈

The new structure and the county, Hebei Province China Pile Driving Machinery Factory, factory has 30 years, the company developed and produced a series of Piling Machinery total of 10 series over 30 varieties, mainly KQ series of submersible Drilling Rig, KLB walker hydraulic auger drilling rig, DZB multi-rig, CFG series pile driver, car rigs, reverse circulation drill, spiral pile driver, hydraulic walking rig, gravel pumps, drilling and engineering products and related accessories (pipe, drill pipe, drill pipe, drill bit, seal apron);.

华构牌反循环钻机效率good，反循环钻机；河北省新河县华构桩工机械厂。河北省新和县华构桩工机械厂，建厂已有三十多年，公司研制生产的系列桩工机械共有10大系列30多个品种，主要有KQ系列潜水工程钻机、KLB液压步履式长螺旋钻机、DZB多功能钻机、CFG系列桩机、汽车钻机、反循环钻机、螺旋桩机、液压步履钻机、砂石泵、工程等产品及相关钻机配件（导管、钻机导管、钻杆、钻头、密封胶圈

NC Drill: Numeric Control drill machine used to drill holes at exact locations of a PCB specified in NC Drill File.

数控钻孔：使用数控钻机和数控钻文件在 PCB 的准确位置钻孔。

He became prime minister in 1997 and won international acclaim for his role in the Northern Ireland peace process.

他在1997年成为总理，并且因为在北爱尔兰的和平进程中发挥的作用受到国际社会的赞许。

Mixed Page Sorting Method Using the cuttable user model, this thesis proposes a mixed page sorting method by using cutted user model in server-side and complete user model in client-side.

隐私分级利用的混合式页面排序方法针对个性化搜索中搜索结果排序的问题，本文利用隐私可控开放的用户偏好模型，提出一个在客户端和服务器端分步进行的隐私分级利用的混合式页面排序方法。