????: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???????????????????????????(?)

?????????????????????:???