?? ?????????????????
????:1?????150:????????
2???????????
3?????????
4?????
5???sn
????????8??????22????????????????? (??? ??????????????)8?????????22???????,??,??????????????
?????????????(?????“?????????”)????????????????????????????????????????
??????,??????,??????????????????????????????????????,???0.0001%0.02%??????,??????????????????????????,????
????????????????????,?????????,????????,???,“?,????,?????????????????1000???????,?????,?????????????????”?
???????????????????,????1???????????5176?????(???5.1%7.6%)???,1?????????????5176???????????????????,?100???????????500??????????,????????50???????
“??????????????????????,??,?600???????????????????200??”????????????,????????????????????????????????,??????????????????,???????????????;?????,??????
????????,?????????????????????????????????
“??,??????????????????????,??????????????????????????”?,??????,????????????????????????????????(???????????????????) ?????????????????????:?????????????????????????????