Helicopters are limited in their forward speed by the spinning rotor blades that make hovering possible.
直升飞机那不停转动的旋翼叶片使其能够在空中悬停，但却限制了它向前的飞行速度。
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Some key techniques on spinning, knitting and dyeing of sea-island fiber knitwear are discussed. The problems and prospects of developing sea-island fiber are put forward.
This paper introduces the application of VT230S frequency converter in nylon spinning, analyses the problem while debugging and brings forward solution.