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Preload condition, the cylinder head bolt-hole depth of deformation of the cylinder sets a great impact on the proper cylinder head bolt hole depth Shen cylinder l

预紧工况下，缸盖螺栓沉孔深度对气缸套变形影响很大，适当的缸盖螺栓沉孔深度有利于减小气缸套变形。

Preload condition, the cylinder head bolt-hole depth of deformation of the cylinder sets a great impact on the proper cylinder head bolt hole depth Shen cylinder liner to reduce the deformation.

预紧工况下，缸盖螺栓沉孔深度对气缸套变形影响很大，适当的缸盖螺栓沉孔深度有利于减小气缸套变形。

The analysis shows that, blade vibration and torsional deformation is the mainly manifestations of the cutting mechanism head body ,the maximum deformation of the helical blade is 18.01mm, the maximum stress value in the welding of corner ,connection of end disk and helical blade is the weak link, helical blade is the main component, which effects the dynamic characteristics of cutting mechanism head body.

所得结论对于改进螺旋钻采煤机截割机构头体的设计、提高其动态性能和使用寿命具有一定的指导意义和参考价值。2、文章中部分措词需要修改，摘要翻译中文化，论文整体格式需要修改。3、数值模拟的约束条件有待商榷，对于结果应该对比实际试验和有关材料特性表，更有说服力。

Cylinder, the cylinder sets of radial a surplus deformation of the cylinder sets a great impact on the cylinder liner reduced radial a surplus amount to reduce the deformation of the cylinder sets, the top surface of the body decreases roughness, but it will increase the body on the plane cylinder only mouth the roughness ; Preload reduced cylinder head bolt deformation of the cylinder liner little effect, the body can reduce the top surface roughness and cylinder body on the plane I ended roughness; Shen appropriate reduced cylinder head bolt hole deep can reduce the deformation of the cylinder sets, but will cause the body and the top surface roughness on the cylinder body only I roughness increases Plane .

工作工况下，对于第2缸来说，气缸套径向过盈量对气缸套变形影响很大，减小气缸套径向过盈量，有利于减小气缸套的变形，减小机体顶面不平度，但会增大机体上缸套止口平面的不平度；减小缸盖螺栓预紧力对气缸套变形影响很小，可减小机体顶面不平度和机体上缸套止口平面的不平度；适当减小缸盖螺栓沉孔深可以减小气缸套的变形，但会造成机体顶面不平度和机体上缸套止口平面不平度的增大。

Based on an experiment of head loss for long-throated flume , the flaw of water head loss calculating formula which based on the theory of boundary layer is pointed out.

在实验的基础上，指出对用边界层理论计算长喉槽水头损失公式的缺陷，分析了局部水头损失产生的机理，补充了进口侧收缩水头损失的计算，对原公式进行修正提高计量精度

S head 保持镇静You should keep your head when your house in fire.

当你的房间起火的时候，你应该保持镇静。

At present, there are many approaches to make a quantitative analysis on head necrosis, many of which take the index of head necrosis range and Proportion of Necrosis area as the most typical guide lines for quantitative diagnosis and Collapse forecast.

目前，通过MRI对股骨头坏死定量分析的方法很多，以坏死范围指数、坏死面积比例的大小为股骨头坏死定量诊断及塌陷预测的最具代表性的指标。结论：MRI可对股骨头坏死灶的大小做出较为准确的判断，可对股骨头坏死的诊治给予重要的指导作用。

This article introduced establishment and characteristics of Head control network of Nanjing No.4 Yangtze River Bridge, discussed about how to improve the accuracy, reliability and other index of Head control network of extra large bridge with present advanced surveying technology, which could afford some positive experiences to similar precise engineering survey projects.

本文对南京长江四桥首级施工控制网的建立及特点进行了介绍，对如何采用当前测绘新技术布测特大型桥梁首级控制网并提高其成果精度、可靠性等相关技术指标进行了探讨，对类似精密工程项目具有积极的借鉴意义。

Because there are three different criteria for such status—income per head, a human assets index comprising health, nutrition, literacy and school enrolments, and an economic vulnerability index (which uses various measures to assess a country's exposure to natural and climatic setbacks)—the data, based on figures for income per head, give no more than a broad indication of graduation timetables.

因为对这些身份而言有三项不同的标准——人均收入、由健康、营养状况、读写能力和入学年纪构成的人均资产指数，以及一项经济脆弱指数（这个指数在评估时使用了大量措施，将一个国家自然环境和气候环境的恶化暴露出来）这些数据，基于人均收入的指标，提供的仅仅是一个毕业时刻表的宽泛指示。

The universal index head is provided at 24 positions so that any particular angle of shape can be obtained, free 3600 or 100 rotation is allowed for grinding End Mills、Twist Drill、Lathe Tools, only replace the attachment to the index head without any complex setup.

磨削分度头可在24种位置下操作以便于磨削任何角度和形状，只需替换分度头上的附件而不需任何复杂的步骤就可进行立铣刀、雕刻刀、钻头、车刀、球头立铣刀的磨削。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。