基本解釋[經(jīng)濟(jì)學(xué)]鍵控管[機(jī)械工程]電鍵管詞組短語短語keyer r tube 鍵控管vacuum -tube keyer 真空管電鍵器keyer tube更多詞組專業(yè)釋義經(jīng)濟(jì)學(xué)鍵控管機(jī)械工程電鍵管