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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?????

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

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

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

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