?? ??? ?????????????40???55???????
????:1???????????:92??95??????
2?95???
3??????????
4?????????
5????????????
??:10??28????????25??????,?“?????????,???”???“???????”?????????,?,????????????,?????
????????????????,??65?????????
??? ?????????:????????30???,???,???,??????1%?????????2%?????????????????,??50???60???,???????,??????????
????,?????,??????????????????????40~55??,????35?????????????????????65?????????????????????????,??????????????????,30%~40%??????
????????? ??????:????????????????,??????????????,????????????,????????????????????,??,???????????????????????,??,???????????????????????????????????,?,??????
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