短語(yǔ)詞組短語(yǔ)permanent -magnet torque 永磁轉(zhuǎn)矩permanent bipolar magnet 雙極永久磁鐵Permanent -Magnet Steel 永久磁鋼NdFeB permanent ring magnet NdFeB 稀土永磁磁環(huán) 返回 permanent magnet