三种速度半自动变速箱。

Three speed semi-automatic gearbox.

youdao

简要分析了目前电梯的三种速度控制方式，最后采用基于绝对剩余距离的电梯速度控制方式来实现电梯的速度优化控制。

This paper presents three modeling of the elevator speed control. Elevator speed control based on the principle of absolute surplus distant is used to optimize speed control.

youdao

估算团队速度的三种方法

Three Ways to Estimate Team Velocity

youdao