????:1?????????:?????????

2???????????

3?????

4????????????

5???????????

6??26?,???????????????????????????????

??????????????????????190.65???,?????8.75????,????600????????????,????????????????????,?????????P2?,???????????????????????????,???????,??????????????????1400???????????????,???????????

???,??????????????“2+3+N”?,?????????????????(???????????????????? ????? ??)

?:???????