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

1.研究纳米材料内部结构输运机制需要有高精度的仪器来量纳米材料的率磁。

2.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.

2.凯尔双臂桥具有灵敏度高、读数准确使用方便的优点，是量材料率磁的有效工具。