index modified

Author: Linear-Space-Theory

docs/courses/professional/materials/analysis_and_characterization_of_materials/index.md docs/courses/professional/materials/analys_charac_of_materials/index.md

@@ -105,12 +105,12 @@ nav:
           - 物理类: 
               - 统计力学: "courses/professional/physics/statistical_mechanics/index.md"
           - 电类:
-              - 电路原理: courses/professional/electricity/principles_of_circuits/index.md"
+              - 电路原理: "courses/professional/electricity/principles_of_circuits/index.md"
               - 电工与电子技术: "courses/professional/electricity/electrical_and_electronic_technology/index.md"
               - 电力电子技术: "courses/professional/electricity/power_electronics/index.md"
           - 材料类:
               - 材料科学基础: "courses/professional/materials/fundamentals_of_materials_science/index.md"
-              - 材料分析与表征: "courses/professional/materials/analysis_and_characterization_of_materials/index.md"
+              - 材料分析与表征: "courses/professional/materials/analys_charac_of_materials/index.md"
               - 工程材料: "courses/professional/materials/engineering_materials/index.md"
           - 计算类:
               - 计算机原理与应用: "courses/professional/computing/principle_and_applications_of_computer/index.md"