A semiconductor is a material with a _____.A.conductivity higher than a normal conductorB.

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A semiconductor is a material with a _____.

A.conductivity higher than a normal conductor

B.conductivity higher than a normal insulator

C.high conductivity at low temperatures

D.low conductivity at high temperatures

请帮忙给出正确答案和分析,谢谢!

热搜:a是b的充分条件,b是a的必要条件吗