Main performance: Seal performance is stable. Merging functions of step-less speed regulation and photoelectric trace into a single whole, operation is convenient.
产品说明：主要性能：封口性能稳定，集无级调速，光电跟踪等功能于一体，操作方便。
Seal performance is stable: Merging functions of step-less speed regulation and photoelectric trace into a single whole, operation is convenient.
封口性能稳定：集无级调速、光电跟踪等功能于一体，操作方便。
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