| http://www.w3.org/ns/prov#value | - the paired two longitudinal steel wires are rotated in the direction opposite to the one direction after passing over the (k+1 )-th transverse steel wire (Ck+1) serving as a centerline, in order to form a rear spiral twisted structure, where k represents the relative positional relationship among the transverse steel wires and is a positive integer including 0, and n represents the relative positi
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