回转

Far marked with the courses of clear winding rills

你的曲线是那么清晰、回转和俊秀。

Using the action-oriented simulation strategy, a simulation software of percussion and rotary drilling has been developed.

根据本文建立的数学模型，采用面向活动的策略编制了一套能模拟冲击回转钻井系统钻井的仿真软件。

The seventh chapter is conclusions and prospects, sums up the innovative ideas and research findings of the paper, puts emphasis on the new drilling tools and new technology of water-saving rotary percussion drilling, which has important environmental value, convenient, and easy to be popularized, at the same time, imperfections existed in study process of the paper were pointed out, and some suggestions were offered for further research.

第七章、结论与展望，总结了全文的主要创新与研究成果，强调了节水型回转冲击钻进新机具及其新工艺不仅简便实用、易于推广，而且具有重要的环境价值，同时也指出了课题研究过程中存在的不足之处，对进一步的研究工作提出了一些建议。

The major structures, critical components and performance parameters of steel ball percussion device and hydraulic percussion device were designed and calculated on the basis of study on rock broken mechanism of rotary percussion drilling, which make it is more scientific and reasonable of design of the two percussion devices.

在研究回转冲击钻进破岩机理的基础上，对球体冲击器及节水型液动冲击器系统的主要结构、关键部件及性能参数进行了理论设计与计算，使得两种冲击器的设计更具科学性、合理性。

Compared with traditional drilling methods with turning drilling rig and percussion reverse circulation drilling rig, the mentioned drilling technology can improve drilling efficiency and quality.

较之传统的回转钻机和冲击反循环钻机钻进，旋挖钻进工艺提高了成孔效率和成孔质量，同时拓宽了旋挖钻机的应用领域。

Warning device with safety and durability in the room. M85D leader can rotate at 135° and the pile hammer and flight auger can be hanged on it at the same time.

室内安装有安全报警装置，安全可靠。M85D立柱可回转135°，立柱可同时挂上打桩锤和螺旋钻孔机。

The scrape tires were pyrolysed under atmosphere of inertia in a pilot-scale rotary kiln designed by Zhejiang University. Pyrolysis experiment was carried out at 500℃, 550℃, 600℃ and 650℃.

采用浙江大学自行开发的中试回转窑热解系统，在无氧的气氛下，对废轮胎进行了热解试验，热解温度为500℃，550℃，600℃，650℃。

Combining traditional DTH hammer with pneumatic rock drill,by reference to the rotational mechanism of rock drill,studies the rotational mechanism of DTH hammer and introduces a new type of DTH hammer that uses backstroke energy of piston to drive drill to rotate.

将传统的潜孔锤与凿岩机相结合，研究了潜孔锤孔底回转机构，介绍了一种新型的潜孔锤。

Mud is a common type or plunger-type piston, driven by the motive power of the crankshaft rotary pump, crankshaft driven through the crosshead and then the plunger in the pump cylinder piston or reciprocating motion to do.

常用的 泥浆泵是活塞式或柱塞式的﹐由动力机带动泵的曲轴回转﹐曲轴通过十字头再带动活塞或柱塞在泵缸中做往復运动。

This paper introduces the principle and classification of mechanical balance,the allowable amount of unbalance and balance precision in the process of mechanical manufacturing,the balance testing method and its principle,the dynamic balancing system,and digital signal processing technology for rotating parts.

介绍了机械平衡的原理及分类，以及机械制造过程中允许的不平衡量和平衡精度，并对回转件的平衡实验法及原理、动平衡测试系统以及数字信号处理技术作了介绍，根据动平衡理论分析了平衡测试技术在生产中的应用。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。