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

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

3?????????

4?????????

5????????

?????????????????12??27????? (????????)12????????????????????27????????????????14????????????,????????7??PC-12????,1?????????????????????20???????????????,????????????

??? ??????

????,???????27???????????,???????????????????????5?????????7??2??,????,????????“??????”?

“???????????PC-12??60?????????????????????,???????1000??,?????”??

???????,?????????????????,?1??20????????????????,????????249??????

“???????????????????????,???????????????????,???????,????????????,?????????!”????????????????

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

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

????,???????,???????,??,???????????????,??,?????????????????,??4?????????,?????????????????????????????????????,?????????,??????

????,?“????+????????????”“??????????+????????????”?????????,??,???????????????????,??,??????????????????(?)

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