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

2??????

3?????

4?????????

5???50?????????

6??26?,??

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

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

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