two stage speed change
... two-speed drive 双速驱动 ; 两档传动 two stage speed change 二级变速 two-speed Europe 双速欧洲 ...
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二级变速主皮带轮 main pulley for secondary change-speed
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工作台采用二级变速箱，用变频无级调速。
Worktable use 2 grades gearbox and frequency conversion stepless speed regulation.
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