???????????????

????:??????????:??????V

??6??15?????????? ?????????????,?????????6????15??18?:16???????,???????????????????,?????6?16???????????????,???????????????????????????????????????????????????35~36???????????,?,?????????37~39?,??????40?????????????

17-19????,?????????????????????????17?????????,??????????????????????????????????????????????????????????37~39??,?????????????????????40????

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

??:

1?????;

2???????;

3???????????????;

4?????

??:????