Two questions about customs declaration: <br>1. Ball screw: What is the working principle and function? Is it used alone? <br>2. Chain guide rail: There are several Z-shaped metal blocks in the attached picture. Are these the accessories of the chain guide rail? What is the effect on the chain guide? <br>3. The mechanical parts of the robot: is it a rack? What is his role? Does it have a transmission function? How does it work? <br>Please reply as soon as possible.
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