?? ?????????????????:??????
![](https://image.chezhanri.com/2019/1211/6270fadf7bcf0d7d0371850413e71b28.jpg)
????:1???????6??:??????
2???????
3???kb???
4?????
5??????????
???????????7????17??????????? ????????,??,????????????????????????????,?????,?????????????,??????????(?????????????)???«??????????????»(GB 159792024)??????
???????????,????????????????,???????????????????????????????,?????????????????????????????,?????????????????????????????«??????????????»????,??????????????????????????????????,????????
????,??????????????????,?????“?????????????”???,???????“?????????????”“?????????????????”“???????????”????????????????,??????????,????????????????????????????“???????”??????????????????,?????????????,?pH???????????????????,???????????????,????????,?????,?????????????????(???)?????????????????????? ?????????????????:??