He is confident that, someday, with his crafts maneuverability and energy-saving vortex generator (a device that creates lift much like dragonfly wings) you wont need airplanes anymore.
他相信，总有一天，与他船的机动、节能涡发生器(显示器制造电梯很像蜻蜓翅膀)你不用飞机了。
Introduces the working-case and the controlling-process of the mine lift, analyses the principle of variable frequency adjust speed and energy saving in terms of theory.
介绍了煤矿提升机的工作情况和控制过程，从理论上分析了提升机变频调速和节能的基本原理。
Introduces the working-case and the controlling-process of the mine lift, analyses the principle of variable frequency adjust speed and energy saving in terms of theory.
介绍了煤矿提升机的工作情况和控制过程，从理论上分析了提升机变频调速和节能的基本原理。
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