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

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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??)

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

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

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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???????) ??:???