6?????????70???????? ???

????:??????300?500:??????

??????????????????7?15?????? (??????? ?????????????)6????????????????????????????????????????15??????????????,6?????????????????,70??,??

??,??,6??????????????????,???????0.5%,?????0.2????????????????????0.7%,????????????????????0.6%,????0.2?????

??????????????????,?????????,????0.4%,??????????????????0.8??,???????????????????????????,??????????0.2%??0.5%???????0.9%,????????0.1?????????0.9%,????????

????6??????????????????,????????????????,??????????,???????????

??????????,6??,70????????????????,??????????????4??,??????????????????????

??????????????????,?????58??,????,?????????????????????,???????“???”??,6????????????????????????????,??,?????????????(????) ?????????????:???