短語(yǔ)詞組短語(yǔ)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 返回 net ton-kilometers