电阻与变阻器考点分析
SCHOOL JOURNAL OF MATHEMATICS(2008)
Abstract
考点1导体和绝缘体导体是容易导电的物体,绝缘体是不容易导电的物体.导体和绝缘体是用来描述物体导电性能强弱程度的.常见的导体如金属、大地、石墨(碳棒)、酸碱盐的水溶液、人体等,常见的绝缘体如塑料、橡胶、玻璃、陶瓷和空气等.其实导体与绝缘体之间并没有绝对的界限,在潮湿、高温、高压等条件下,
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