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Synchronous device adopts a low-speed torque drive, so that the stage in the stretching process of the absolute parallelism, freely, and stretched, it can realize automatically fill. 同步裝置采用低速大扭距驅動，使舞臺在伸縮過程中絕對平行、自如、伸縮到位，可自動實現(xiàn)補平。