?? ?????????????????????????
![](https://image.chezhanri.com/2019/0523/20190523152128225.jpg)
????:1???300???????:????????????
2???????
3??????????
4????????
5???????
?????????????6??????27?????????????? ????????????????,???,??????????(ISO/TC 81)???,?????????????
?????????,?“??????”???????????????????(FAO)??,?????????????????????30%~40%????????????????????????,?????????????????????????????????,??????????????????
ISO/TC 81??,??,????
??????????????:??????????