?? ?????????????????21?? ?600????
????:1????????:?????
2????????
3????????????
4????????
5????????????
?????1??????7?????????????? (? ???????????)????????????????????,??????????????????7?15??????????????????30??,????????21??,??????????????????600???????
1?7?,???,??,?20????,???200?,??????????300??????????????????????????10?15?????????????????
??????????????????????????,????????????????????????????????????????,????????7??15?????????30?,??7??,?21?????????????????,???????????????????????????????600?,?????????????????????116??,????????2?,?????????????100?????????????
??????????,???????,???????????????????300?????????(?????????)
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