No perfect insulator(绝缘体) exists, nor does a perfect conductor(导体).
举一反三
- “conductor” means_______. A: 绝缘体 B: 导体 C: 半导体 D: 电极
- He is so excellent in his job, so he will be_______ this job. A: perfect B: perfect for C: perfect to D: perfect with
- On the surface of a perfect conductor, the normal component of the electric displacement vector is A: continuous with the normal component of the electric displacement vector inside the conductor B: uncertain C: equal to the surface density of free charge on the conductor surface. D: equal to zero
- 中国大学MOOC: Perfect competition exists when many consumers are buying standardized products from a few small businesses.
- The materials of solar cells are mainly materials. A: conductor B: insulator C: semiconductor D: --