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

2?????????

3?????

4?????????

5????????

??9??6????????????? (?????????????????????)???????????????????????6?(???“??”)?,???????????????????????????PPP?????????????????????(?????????????????????“??????”)????

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

????????????????????,????????????1984???????????????????

?????????????,?????????????????????,?????650?????,????19???

????,???????,??,??????????????????????????

?????,??,?,??(??)

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