2?????????????21???????,?,??????????????

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

??,??,????????????????????????34.1???????????,???????????3??????49%,??51%,????93.6%,???????????????????????39%,???????????????13%??????????,?????????????????????(???)????????????????(? ?????)

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

“????????”????

?? ???:???34.1???????????

????:1?????????:????sn????

2?????

3??????????????

4??????V

5????????

2?????????????21???????,?,??????????????

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

??,??,????????????????????????34.1???????????,???????????3??????49%,??51%,????93.6%,???????????????????????39%,???????????????13%??????????,?????????????????????(???)????????????????(? ?????)

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