????:1????????vx:????????????

2?????????

3???????

4??????????

5???????

??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???????????????????,??,????(??????????????????) ??:???????