[经] ratio of net income to net slaes

jìng shōu yì duì xiāo shòu jìng é de bǐ lǜ ㄐㄧㄥˋ ㄕㄡ ㄧˋ ㄉㄨㄟˋ ㄒㄧㄠ ㄕㄡˋ ㄐㄧㄥˋ ㄜˊ ㄉㄜ˙ ㄅㄧˇ lv4