On the base of both consideration of heat transfer performance and resistance, the optimization and research are carried out on single spiral duct double pipe condenser.

Discussion on the Thickness of Insulation for Spiral Duct in Marine Air Conditioning System

船舶空调系统螺旋风管绝热层厚度的探讨

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Discussion on the construction of double spiral duct in large space buildings

大空间建筑双层螺旋风管施工工艺探讨

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A discussion on increasing the service life of spiral bevel gears on drill rigs

提高钻机弧齿圆锥齿轮工作寿命因素探讨

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Integral spiral heavy weight drill pipe is to extend the central upset of heavy weight drill pipe and to cut spiral groove on heavy weight drill pipe.

整体螺旋加重钻杆是在整体加重钻杆的中间加厚部位延长并铣削螺旋槽。

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Analytical Calculations of Backing-off Angle of Involute Spiral Surface Twist Drill

渐开螺旋面麻花钻后角的分析计算

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A New Method of Grinding the Spiral Surface Drill Point

螺旋面钻尖刃磨的新方法

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Drilling-into-pile techniques by the Short Spiral Drill is introduced through examples, which can be covered in the construction of city roads.

通过实例详细介绍了短螺旋钻机钻孔成桩工艺，在城市道路建设中具有推广价值。

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Spiral drill pipe: Cold-drawn forming a blade, anneal, good toughness, and durability.

螺旋钻杆：冷拉一次成型叶片，不退火，韧性好，耐用。

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The machine equipments needed has spiral drill press and drill to expand machine or diving drill press.

所需机械设备有螺旋钻孔机、钻扩机或潜水钻孔机。

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Spiral drill: steel blades, drill, wear resistance.

螺旋钻头：铸钢叶片，钻尖，耐磨。

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Mathematical Model for Variable Pitch Spiral Drill Point and Grinding Interference

变螺距螺旋面钻尖的数学模型及其刃磨干涉

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They have not measured the length of spiral drill collars and monel collars yet.

他们还没测量螺旋钻铤和无磁钻铤的长度。

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The Constructional Techniques and Equipment of Underwater Pile-making with Long Spiral Drill

长螺旋钻水下成桩工艺及设备

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The Effective Control of Spiral Bevel Gear Quenching Distortion by Improving Quenching Dies

改进淬火压模有效控制螺旋锥齿轮淬火变形

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The line that extends along the end of the extra half-plane of atoms for an edge dislocation, and along the center of the spiral of a screw dislocation.

刃型位错中多余半原子面边缘的连线，或者螺型位错中错排螺旋的中心轴线。

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Conclusion: MRI and 3D SSD are effective methods in showing vertebral fracture, height, fragment fracture dislocation to vertebral canal and vertebral canal stenosis, especially, 3D SSD is much valuable in vertebral spiral dislocation.

结论：MPR和3D SSD对于椎体骨折，椎体高度、骨折片后移及椎管狭窄显示效果好，尤其3D SSD对于椎体旋转、脱位最有价值。

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A Note on The Asymptotic Density-Potential Relation of The Spiral Galaxy With Finite Disk Thickness

关于有限厚度旋涡星系中密度-引力势渐近关系的一个注记

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Study on sensitivity of piezo spiral transducer Acme Disk

压电盘簧换能器灵敏度研究

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In addition, the spiral chart of decline disease was mapped based on the action size and time order of various nosogenetic factors during the incidence of decline disease, which was used to visually describe and quantitatively analyze the disease with complicated causes.

此外，依据各致病因素在病害发生发展过程中的作用大小和时间顺序，绘制出国外松衰退病的螺旋图，为该类病原复杂的病害形象描述和定量分析作出了探讨。

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The reality that led up to the president's monumental life change is the reality that faces more and more men and women every day: the seemingly unstoppable downward spiral of coronary heart disease.

导致这位总统的生活发生如此巨大转变的现实，其实也是越来越多的男性和女性每天都在面对的：看似无法逆转的且不断恶化的冠状动脉心脏疾病。

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