九年义务教育三年制初级中学教科书《物理》第二册 P86练习第4题导体的电阻是导体本身的一种性质,它的大小决定于导体的____、____、____和____.根据题目可知,导体的电阻大小决定于导体的材料、长度、横截面积和温度.然而从教科书电阻大小的决定于导体的材料、长度、横截面积,这三者是本质因素.从图7-5的演示实 Nine-year Compulsory Education Three-year Elementary Middle School Textbook “Physics” Book 2 P86 Exercise 4 The conductor’s resistance is a property of the conductor itself, and its size is determined by the conductor’s ____, ____, ____, and ____. According to the topic, the resistance of a conductor depends on the material, length, cross-sectional area, and temperature of the conductor. However, the size of the resistor depends on the material, length, and cross-sectional area of ​​the conductor. These three are essential factors. Figure 7 -5 demonstration