1. It refers to a general-purpose temperate zone or pressure device used to place bags, ropes, cables, iron wires, etc., and its composition is as follows: it can be a lower surface of a square, a circle, an ellipse or a rectangle; it can be a higher surface of a square, a circle, an ellipse or a rectangle; A union perpendicular to the upper and lower surfaces, the two surfaces are basically parallel; the lower end of the two lower ends is the lower end of the lower end; the two upper ends are the two ends of the top.
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