基本解釋[經(jīng)濟(jì)學(xué)]淨(jìng)噸公裡詞組短語短語net freight ton -kilometers 貨物淨(jìng)重噸公裡net -ton-kilometers per kilometer of line 淨(jìng)重貨運(yùn)密度freight net ton -kilometers 貨運(yùn)淨(jìng)噸公裡net ton-kilometers更多詞組專業(yè)釋義經(jīng)濟(jì)學(xué)淨(jìng)噸公裡