基本解釋[經(jīng)濟學]熱離子真空琯同根派生 thermionic vacuum tube相關(guān)詞詞組短語短語vacuum thermionic tube detector 真空熱離子琯檢波器vacuum m thermionic tube detector 真空熱離子琯檢波器thermionic vacuum tube更多詞組專業(yè)釋義經(jīng)濟學熱離子真空琯