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

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

?????????????6??15?????? ??,??6??????????15??18????:?????,6?????15???20?????16?20????????????,??????????????????????????????????????????????,???????????,????????????????????????????????????????????(100~200?????????????)???(??30~50?,?????70??????????????????),??????

??

????:

1????????????;

2???????????????,????;

3??????????,?,?????????????????;

4???????????????????,????????

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