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

2???????

3?????

4???????

5??????

?????????????2???????????12??????? (????????????????? ???????)???????????2??11???17?????????????????30??,??????????????????????(???:?)?????????,??(??????:?????????????)??YF-75DA????,???????????“?????????”?

??????,???????????,????????????????????????????????????4????????????YF-100?????,2????????????????YF-75DA???????????????

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

??????????????,???????????24????,?,????????????????????????,?????????????,??,??????????????????????????,???????,????????????,??????????,????????????,?????????????????

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