First he coiled some insulated wire around an iron bar, connecting both ends of the wire to a galvanometer. 他先把一些绝缘导线绕在一根铁条上，并将导线的两端与一个电流计连接起来。
New wire materials of bundle insulation conductors with multi-cores were designed for the demand of rural power network reconstruction. 绝缘导线束是将多股相互绝缘的导线平行连接在一起的一种新型导线结构。
