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2??????????

3??????????

4???????????

5???????

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