????????????

??

???????????2?5???????????? ??“?”5??????????????????????,????3??4????4????????????7.3??,??9??????

????????????,??“?????”?

??????????,??????????????(?S)?????????????,????????????????,?????,???????5????

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

???“???”?????,?,1??21???????????????????2??3??????????????????142??,???25????????2????2??,???65?46.3%,?68.6%?

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

?????????

??????????????????????

????????