1、The rheochord is a type of electrical instrument used to measure the resistance of an electrical circuit.
可变阻抗法是一种用于测量电路电阻的电气仪器。

2、By using a rheochord, scientists can accurately measure the resistance of different materials and study their electrical properties.
通过使用可变阻抗法，科学家可以精确测量不同材料的电阻并研究它们的电性能。