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- Study of vortex mechanism and rule of bottom drill string 下部钻柱涡动机理及规律研究
- Research on vibration problems which is the main reason causing bottom drilling tool failure, can reduce drilling tool damage and emergence of underground accidents. 摘要振动问题一直是引起底部钻具失效的主要原因,对其进行研究能减小钻具损害和各类井下事故的发生。
- When the mechanics performance of BHA(Bottom Drilling Assembly),that consists of conventional stabilizer and drilling collar,can not meet actual operation,it has to be changed. 常规稳定器和钻铤构成的底部钻具组合(BHA)其力学特性不能改变,若与实际要求不相符合时,必须起下钻更换。
- At six we were fallen in for drill. 六点钟我们站好队准备操练。
- They sent the enemy ship to the bottom of the sea. 他们把敌舰击沉。
- The sound of that drill jangles horribly on the nerves. 那台钻机的声音响极了,十分刺耳。
- The child was sitting on the bottom stair. 那孩子正坐在楼梯最下面的一级上。
- 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。
- I intend to get to the bottom of it. 这件事我打算寻根究底。
- He was always bottom of the class in maths. 他的数学成绩在班上总是垫底。
- She had lots of drill in listening. 她在听力方面受过许多训练。
- The dregs have settled at the bottom of the bottle. 渣滓都沉到瓶底了。
- 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。
- I fell right to the bottom of the stairs. 我从楼梯上一直摔到楼梯下面。
- The police found a body at the bottom of the lake. 警方在湖底发现了一具尸体。
- What's the drill for claiming expenses? 费用报销的手续,是怎样的?
- His bottom waggle in a funny way when he walk. 他走路时臀部扭来扭去,很可笑。
- The bottom of the boat was rusty. 船底生锈了。