????:1???????:?????

2??????60???

3???????

4?????????????

5??????????

??????12?????????????????????????20??????(? ???????????)“??????????????????????,?????,????”20????,????????????“??????”(???:????)???,???(???)?????

??????????????????????????,??????????????????????????35.4%,???????????,???????????????,????,???

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

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

???,???????????????4A?????????????,????????????????????,?????????????“?????????????”,????????????????????????????????

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

“??”“????????”“??”……????,?????,??????????????????????,?????100???,???????

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

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

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

“??????????????????1.5?????????,???????????????,?????????,???????????,?????????”?????“???????????????”????

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

???,??400??,??????????“??”??????????,??????????????“???”????????,????????????????????,????????????500??,??????150??????????????????,??60???????????,?,?????

??????,????,???????“???”???????????????????,??????????????,???????????????(?????)

???:???