导体通常指电阻率  < 10-4  · cm 的物质。金属和合金一般都是导体，如铝、金、钨、铜、镍铬 等。能带能隙很小或为 0 , 在室温下电子很容易获得能量而跃迁至导带而导电。-Usually refers to a conductor resistivity  < 10-4  cm material. Metals and alloys are generally conductors such as aluminum,

地表起伏地形在野外矿产资源勘察中不可避免，其对直流电阻率法勘探影响巨大．近年来，电阻率三维正演 取得诸多进展，特别是应用非结构网格我们能够进行任意复杂地形和几何模型的电阻率三维数值模拟，但面向实 际应用的起伏地形下电阻率三维反演依然困难．本文基于非结构化四面体网格，并考虑到应用ＧＰＳ／ＧＮＳＳ时，区 域地球物理调查中可非规则布设测网的实际特点，实现了任意地形（平坦或起伏）条件下、任意布设的偶极

Materials can be categorized into conductors , semiconductors or insulators by their ability to conduct electricity. It is a popular belief that insulators do not conduct electricity because their valence electrons are not free to wander throughout t