dual speed switch
... dual slope torque rise governor；双斜率增扭调速器 dual speed switch；双速开关 dual stage relief valve；双级安全阀 ...
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快速双向开关 fast bi-directional switch
双速行驶开关 two-speed travel switch
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这种结构的双速开关结构简单、传动效果好。
The double speed switch has the advantages of simple structure and good transmission effect.
youdao
额定频率为50Hz，JP2D双速磨光电机可带速度转换开关，方便快慢速度的转换。
Rated frequency is 50Hz. The JP2 double-speed finishing motors are with speed-change switch for changing quick or slow speed easily.
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