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