油门踏板降档开关在需要时提供更快的通过速度。
An accelerator pedal kickdown switch provided faster passing when needed.
通常，数控机床在自动加工或手动运行中通过速率调整开关来实现有限的几档变速。
Usually, there are only several grades for speed change by a switch during automatically machining or manually controlled moving in CNC machines.
通常，数控机床在自动加工或手动运行中通过速率调整开关来实现有限的几档变速。
Usually, there are only several grades for speed change by a switch during automatically machining or manually controlled moving in CNC machines.
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