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- C. drive system, which consists of asynchronous electrical motor and frequency converter to the geological drill in the case of modelling rotation and hoisting. 实验结果表明：交流变频驱动系统其调速范围宽，驱动特性好，可实现带载频繁启动；
- engineering geological drilling rig 工程地质钻机
- Seamless Steel Pipe For Geological Drill In 地质钻探用管
- Furthermore, the cost-effective and well-organized geophysical exploration programs can significantly reduce the inherent risks and amounts of geological drillings. 同时还可以大大降低工程验证的盲目性和巨大浪费。
- The brief description is given of the positive ion polymer mud system. A preliminary study hasbeen conducted in slim-hole coal geologic drilling resulting in some perfect effects. 对阳离子聚合物泥浆系统作了简要介绍．并在小口径煤田地质钻探中作了初步应用研究，取得一定效果。
- A dismantling and assembling machine for four-leg drill derricks and a mechanically assembleddrill derrick have been developed, which are thought to the trend of the geologic drill derrick. 指出了目前钻塔拆装存在的缺点，提出了解决的新途径，研制成功了四腿钻塔拆装机及机装可逆式四腿管子钻塔，认为这是地质钻塔发展的新方向。
- The drilling troops mustered on the hill. 演习部队在小山上集合起来了。
- The workman is drilling in the wall. 工人正在墙上打孔。
- Drilling is cutting a hole with a drill. 钻削就是用钻头钻一个孔。
- At six we were fallen in for drill. 六点钟我们站好队准备操练。
- The noise of the drilling is intolerable. 钻孔的噪音让人受不了。
- The sound of that drill jangles horribly on the nerves. 那台钻机的声音响极了，十分刺耳。
- You'd better set a goal before you start the drill. 练习开始前，你最好设定一个目标。
- After a long drill he told the squad to fall out. 操练了好半天之后，他让这个班解散了。
- THE MICROSTRUCTURE AND MECHANICAL PROPERTY OF GEOLOGICAL DRILL ROD WELD JOINT FROM FRICTION WELDING 地质钻杆摩擦焊接组织和力学性能
- She had lots of drill in listening. 她在听力方面受过许多训练。
- This drill can bore through rock. 这台钻机能钻透岩石。
- The dentist's drill made a lot of noise. 牙钻发出很大的噪音。
- What's the drill for claiming expenses? 费用报销的手续，是怎样的?
- The class is chopped up into small groups for oral drill. 为进行口语训练，班级分成为几个小组。
