????????????,???,???,????????????????“??????????????”???

???,????,???????,?,????“??????????”???

?????,??“????”?????????

???“?”??????????????2?????8???????????????????????,??????????????????????????????????????????,????????????????????5???

??? ??:??,???,???8??10??????????????,???????????,??“???”?

???????,??80%??,???“??????????????????”??

“???”???“????”,???,???,?????“????”?????????,????????????????“?”?????

??? ????????????:?pH????,???7??????????????????8??,????????????????,???

??????????,????????????????“??”

???????????“?????????????”????????????????“??”?????????,????,????????????????,????????????

???????????????“???????????????????”???????,????????????????????????

??,“?????????????????????????”

??,????“??????”????“???”,????“????”,??,????????

????????????? ???:?????????????????,??????????,????????????,???????????????????????????????????

???????,??“??”,?????????????????,??????,??????????????“?????????????????????????”????????????????,???

?????????????:????????????????????????

??

??:???????????,??????????,??????????????