短語詞組短語Magnet NS Pole Indicator 磁極判斷器magnet t pole 磁極Magnet Field Pole Searcher 磁場極性搜尋棒magnet separating pole 磁選柱permanent -magnet pole 永磁極permanent magnet pole piece 永久磁極部分magnet pole pieces 磁極塊magnet pole piece 磁極端free magnet pole 自由磁極 返回 magnet pole