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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?????

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

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