High precision instruments of measuring electrical resistivity and magnetoresistivity are needed to study the inner structure and resistance characteristic of nanocrystalline materials.

研究纳米材料内部结构和输运机制需有精度的仪器来量纳米材料的和磁。

Kelvin bridge has the virtues of high sensitivity, precision reading and convenience to use.It is effective tools to measure the electrical resistivity and magnetoresistivity.

凯尔文直流双臂桥具有灵敏度、读数准确和使用方便的优点，是量材料和磁的有效工具。