Speed change gears is widely used in mechanical transmission system.
机械传动系统中广泛使用齿轮变速装置。
Gears inside the transmission change the vehicle's drive-wheel speed and torque in relation to engine speed and torque.
变速器内的齿轮，改变车辆驱动轮和发动机之间转速和扭矩的比例。
The frequency change and speed adjusting has become the backbone of modern electrical transmission and it is the necessary technics of modern chemical fibre industry.
变频调速技术已成现代电气传动的中枢，也是现代化纤行业必备的工艺技术。
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