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人民教育出版社物理室编的九年义务教育三年制初中物理第二册《教师教学用书》第77页中提到:“电阻是物质的属性,是由导体本身因素决定的,不会因为通电情况的不同而不同,这与以前学过的密度ρ=m/V 只与物质本身特性有关而与那块物质的质量大小、体积大小无关一样.”
The 9-year compulsory education system compiled by the People’s Education Press Physics Room mentioned in the second edition of the junior middle school physics book “Teacher’s Instruction Book” on page 77: “The resistance is the property of matter, and it is determined by the conductor itself. Because of the different power conditions, this is related to the density ρ=m/V that has been studied before. It is only related to the properties of the material itself and is independent of the mass and size of the material."