column drill

bar rigged drifter

架式风钻，架式凿岩机

Preliminary Study on Well Drilling Technique of Semi-Submersible Drilling Platform with Dual Derrick Rig

半潜式钻井平台双井架钻机作业工艺初步研究

Study on Dynamic Characteristic of Double Elevating Drilling Rig Derrick and Substructure;

双升式钻机井架及其底座动态特性研究

churn-type percussion drill

无游梁绳式顿钻钻机

mixed oil drilling rig

复合式石油钻井钻机

Portable pneumatic extinguishers Bench test methods

便携式风力灭火机　台架试验方法

Operational Risk Management: Framework,Mode and Construct;

操作风险管理体制:框架、模式与建构

A hand - held machine for drilling rock and breaking up pavement, operated by compressed air.

手挂式风钻，轻型凿岩机通过压缩空气运转的钻岩石、挖隧道的手持机器

"drilling rig, platform"

"钻井井架,钻井平台,见 oil (drilling) rig"

The Analysis of Principle for Drill Frame of MG100 Hydraulic Roof Bolter

MG100全液压锚杆钻机钻架工作原理分析

back-brake support

顿钻捞砂轮刹车支架

stacking capacity of derrick

井架的钻杆立根容量

bridge of the bit

四牙轮钻头牙轮支架

The piano has a quaint old-world tone about it.

这架钢琴的音色具有一种古雅的老式风味。

Light fitting product,14" fan,32 W photocatalyst tube.

轻钢架专用，10寸风扇32W玻组套管式光触媒灯管。

The Construction Project Quality Management Model under the Risk Management Framework;

风险管理框架下的建设工程质量管理模式探析

Discussion on the Concrete Structure Forms of Wind Turbine Tower

风电机组用混凝土塔架结构形式的探讨

A tall framework over a drilled hole, especially an oil well, used to support boring equipment or hoist and lower lengths of pipe.

钻架竖在钻井（尤指油井）之上的支架，用来支撑钻孔设备或提升和下放钻管