?? ?????????????????????????
![](https://image.chezhanri.com/2020/0401/a1a5d66213c34d7d4e9dab39eb5db6fe.jpg)
????:1??????:??????100?????
2?????????
3???????????
4?????????
5???????????
???6???27?????????? ????????????????,??????,???(ISO/TC 81)?????????????????????,???
?????????,??????????????“???????????????”???(FAO)?,????????????30%~40%????????????????,???????????????????????,???????????????????????????
ISO/TC 81????????????????,??????,???????????????????
??????????????:???