Depression is often caused by a combination of factors, so what is known as a "downward spiral" effect often occurs.

1、

The Spiral Decrease Effect of General Demand under the Price Falling

论价格总水平下降的总需求螺旋下降效应

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2、

Numerical Simulation of Convection Heat Transfer with Pulsating Flow and Spiral Flow in a Duct; fixed screw propeller shrouding

管内流体脉动及螺旋流对流换热的数值模拟定螺距螺旋桨导流管

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3、

The three-dimensional simulation model of the spiral inlet duct of a diesel engine is created with the FIRE software, and CFD simulation of inlet flow is carried out.

利用FIRE软件建立了某柴油机螺旋进气道的三维仿真模型，对进气流动进行了CFD模拟计算。

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4、

Taking Suzhou International Expo Centre as an example, presents the connection technique, hanger form and installation strategy of the double spiral duct in large space buildings.

以苏州国际博览中心为例，介绍了大空间建筑双层螺旋风管的连接工艺、吊架形式和吊装方法。

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5、

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.

本文在综合考虑传热性能和摩擦阻力等因素的基础上，对单螺旋槽套管式冷凝器的结构进行了优化和研究。

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6、

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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7、

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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8、

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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9、

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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10、

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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11、

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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12、

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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13、

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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14、

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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15、

Spiral drill: steel blades, drill, wear resistance.

螺旋钻头：铸钢叶片，钻尖，耐磨。

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16、

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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17、

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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18、

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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19、

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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20、

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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