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

????????????????????????????????“?”(????????????????????,??????)??68.6?,????????????3?????

?????2???????????1?????????2???,????2??????????????????????????????????????????1???????2????7???,??5????????????????????,??2??????

???,?????????40?????,????,???????

(?? ??? ?????)

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

??“?????????”

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

????:1??????????:???????50????

2????????????

3?????????

4???100??

5?????

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

????????????????????????????????“?”(????????????????????,??????)??68.6?,????????????3?????

?????2???????????1?????????2???,????2??????????????????????????????????????????1???????2????7???,??5????????????????????,??2??????

???,?????????40?????,????,???????

(?? ??? ?????)

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