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

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

?12?19??????????? ????????,?????,??????????????????????????19??????????21?????,???;???????????,???????,???????????????????????

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

19???????????21??????,?,???????????????????????????????4~6?,??2~4?,????,??????????????????6~8?,??????????????????10????????????4~5?,??6~8??;????6~8?????????????????????9~10???????

?????????????12?19??????6???:????????,12????19??8?20?8?,????????????????????????5~6???????????????????7~8????,?????,????????????????????????6~7???????????????8~10????;???????????????????????????????????????????7~8??????9??????,?????????????????????????9?????????????10~11???

?(12????19????8?-20??8????)

?

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

????????????,19???????21?,????????????????;????,??20???21????,?,??????????

????

12????????19????????????8??20????????8?,???????????????????????????????????????????????????????????????????????????4~6?,??,??????7??;????????????????????????7~8????????9???

??(12??19????8????-20???????????????????8?????????????????)

12?????20????8?????????????21??????8???????????,???????????????????????????????????????????????,?,??????(5~8?)??????????????????????????????????4~6????????????;??????????????7~8?????

?????(12??20?8???????-21????8????????)

12?????????21?8??????22?8??????,?????????????????????????????????????????????????,??,???????????(5~9?)?????????????????????????????????????????

???????(12??21??8??-22??8???????????????????) ???:????????