thermal conductivity vacuum gauge

例句：

1. 1.Thermal conductivity is a crucial factor in determining the efficiency of a heat exchanger.
   热导率是决定换热器效率的关键因素。
2. 2. Thermal conductivity tests are used to measure the thermal resistance of materials.
   热导率测试用于测量材料热阻。
3. 3.Thermal conductivity can vary greatly depending on the material's composition and structure.
   热导率可以根据材料的组成和结构有很大的变化。