采用任意中弧线叶片造型程序，将某单级跨声、常规设计的风扇改进为复合掠形设计。
An arbitrary airfoils blade design procedure was adopted to redesign a transonic fan with compound swept.
本文研究了加工经可控曲率修正的蜗轮齿面的滚刀设计问题，建立了相应的数学模型，并应用计算铲磨蜗轮滚刀刃形曲线的单参数包络法，求出铲磨砂轮截形曲线。
This paper studies the relief grinding problem of the hob of point contact worm gear drive and puts forward a one-parameter enveloping method to calculate the axial profile of relief grinding wheel.
一种双侧凸形usb连接器和具有一个或者多个凸形usb连接器的各种卡状器件，可以是单侧或者双侧，其尺寸设计成可嵌入到US B插座内。
A double-sided male USB connector and various card-shaped devices having one or more male USB connectors, which may be single or double sided and are dimensioned to fit into a USB receptacle.
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