[经] ratio of net operating profits to net sales

yíng yè jìng lì rùn duì xiāo shòu jìng é de bǐ lǜ ㄧㄥˊ ㄧㄝˋ ㄐㄧㄥˋ ㄌㄧˋ ㄖㄨㄣˋ ㄉㄨㄟˋ ㄒㄧㄠ ㄕㄡˋ ㄐㄧㄥˋ ㄜˊ ㄉㄜ˙ ㄅㄧˇ lv4