基本解釋[經(jīng)濟學]外反饋式磁放大器詞組短語短語external l feedback magnetic amplifier 外反饋式磁放大器external crack feedback magnetic amplifier 外反饋式磁放大器external feedback type magnetic amplifier 外反饋形磁放大器external feedback magnetic amplifier更多詞組專業(yè)釋義經(jīng)濟學外反饋式磁放大器