?2??22??????????(?????????????????? ????)???????????22?????????????(???????“??”)??????,??????????????6????????????????????15??????????????

????,???????D?????????????,??????,?,????

?????????15?????????????????????????? ?????

?????????????,??????????;????????,??????????

??,??????????,?????????????50‰??,?,???????????4??6??????,??,???

??????2428??????/??,?????????27????????????????,?????

?,????????? ??????

?,????????????????????????????????????????????????,???????

????PHM(???)??????????,??????????????????????,????????????(???)

???????:???

??

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