三角结构的外层导电铜轮分内外两沟，铜线经内沟引入，完成退火。
Triangular structure of the outer conductive copper wheel points inside and outside two groove, the copper wire inside groove introduced, complete annealing.
三角结构的外层导电铜轮分内外两沟，铜线经内沟引入，完成退火。
Triangular structure of the outer conductive copper wheel points inside and outside two groove, the copper wire inside groove introduced, complete annealing.
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