electric switch oil

例句：

1. 1.The electric switch oil is essential for the proper functioning of the electrical system.
   电开关油对于电气系统的正常运行至关重要。
2. 2.The technicians had to replace the old electric switch oil with new ones.
   技术人员不得不用新的电开关油来替换旧的。
3. 3.The electric switch oil was tested for its resistance and insulation properties.
   电开关油被测试了它的电阻和绝缘性能。