一、单项选择班(在下列各题的四个选项中,只有一项是符合题意的。本大题共4O小题,每小题3分,共120分) 1.不同的物质有不同的电阻率,通常将电阻率小于l。一‘n .m的材料称为_。 人.导体B.半导体 C.绝缘体D.超导体 2.非静电力把单位正电荷从负极经电像的内部移送到正极所形成的电 First, a single choice classes (in the following questions four options, only one is in line with the ins and outs of the major problems a total of 4O small questions, each small question 3 points, a total of 120 points) 1 different substances have different Resistivity, the resistivity is usually less than l. A 'n .m material called _. Person B. conductor B. semiconductor C. insulator D. superconductor 2. non-electrostatic force The positive charge from the negative electrode through the internal transfer to the positive electrode formed by the electricity