[经] operating ratio based upon net sales
àn xiāo shòu jìng é jì suàn de yíng yè bǐ lǜ ㄢˋ ㄒㄧㄠ ㄕㄡˋ ㄐㄧㄥˋ ㄜˊ ㄐㄧˋ ㄙㄨㄢˋ ㄉㄜ˙ ㄧㄥˊ ㄧㄝˋ ㄅㄧˇ lv4