?? ???????????????
????:1??????????:???????????
2?300?3????????
3??????
4???????
5????????
??6??15??????????? ?????,??????6?????15?18?:??,6??15???20??????????16?????????????20?,?????????????????????????????????????????????????????????????????????????????????,??,????(100~200??????????????????????????)??(?????????????????30~50????,????70????????????????????),??
?????:
1???????????????????;
2???,????????????;
3??????????,??,?????;
4?????????????????????,??????????
??????:??????