gear changing arrangement 齿轮变速装置
selective system of gear changing 变速箱的选择机构
speed-changing gear boxes 齿轮变速箱
gear changing by foot 脚踏换档 ; 脚踏变速
gear changing mode 换档方式
turning with gear changing 挂轮法车削
And the mechanical or pneumatic mechanical gear changing was adopted.
过去一直采用的是手动机械式换档或气动机械式换档。
Multi gears is commonly used for the winch of oil RIGS each with different gear changing method.
石油钻机的绞车一般设计成多个档位，各档的挂合和变更方法都不同。
The combined benefits make this a more efficient method than the old one-by-one gear changing method.
各种各样的好处使得这种驾驶方法，比一个接一个换挡的老式方法，更加有效。
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