同时分析了下冲程抽油杆所产生的螺旋弯曲变形。
Deformation of helical buckling appeared on rod during down stroke is also analyzed.
通过对天然气在螺旋弯曲和正弦弯曲流道内的流动速度、密度和螺旋度进行研究，得到天然气对弯曲油管的作用力。
After studied the natural gas flow speed, density and helicity in the spiral and sine flow channel, the effects of natural gas to the bending tubing was obtained.
在1980年，飞利浦成为荧光灯销量第一的公司，与通用的螺旋灯管不同，他们设计了一系列弯曲型灯管。
In 1980, Philips became the first company to market a CFL, with a design based on a series of bends rather than GE's spiral.
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