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。
It adopts the digital code signal to control the gear changing and the states of the electric switch.
电子选发器采用数码信号控制换档和电子开关选通，从而克服了机械选发器的弊端。
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。
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