?11????22????????????????????? ??22?????????????,???????????????????,??????????????

??,??????????????,????????????29???????,???????????????????????????????????????????15?????????????,??????

?????,????,??????????,??????????,???,??????818.6??????,???48.8%;???,????488.5?????,????????????????????78.6%?

“???????????????,??????????????,????????,???????????????”?? ?????????????????????????:????????? ??“???sn??”????

?? ????:???818.6???????????,???48.8%

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

2??????

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

4???????

5????????

?11????22????????????????????? ??22?????????????,???????????????????,??????????????

??,??????????????,????????????29???????,???????????????????????????????????????????15?????????????,??????

?????,????,??????????,??????????,???,??????818.6??????,???48.8%;???,????488.5?????,????????????????????78.6%?

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