基本解釋[經(jīng)濟(jì)學(xué)]內(nèi)螺紋截止閥詞組短語短語Inside screw stem stop valve 下螺紋閥桿截止閥inside screw stop valve更多詞組專業(yè)釋義經(jīng)濟(jì)學(xué)內(nèi)螺紋截止閥