短語詞組短語magnetic field action 磁場作用magnetic screening action 磁屏蔽作用magnetic c action 磁酌electro kymograph magnetic action 電磁作用electro -magnetic action 電磁作用direct magnetic pulse forming action 電磁脈沖直接成型magnetic recording wire screening action 磁屏蔽作用action of magnetic field 磁場作用 返回 magnetic action