下列对材料的认识正确的是a�料和铜都是很好的绝缘材料b各种材料中铁的导电性能最好c硅是应用较多的半导体材料d碳是很好的磁性材料 Template




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tomski下列对材料的认识正确的是a�料和铜都是很好的绝缘材料b各种材料中铁的导电性能最好c硅是应用较多的半导体材料d碳是很好的磁性材料 coloring