nulling device

例句：

1. 1. The nulling device was usedto remove the magnetic fields from the oldrecords.
   使用消磁设备来去除旧记录中的磁性。
2. 2. The nulling device isessential for maintaining the integrity of magnetic media.
   消磁设备对于保持磁性介质的完整性至关重要。
3. 3. The nulling device was designedto quickly and efficiently remove any residual magneticfields.
   消磁设备被设计成能够快速且高效地移除任何剩余的磁性场。