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

2???????

3????????

4????????????

5?????????

???????????2???22?? ????:????22?????????????????????,????21??????????????,????

??,?????????????????,?????????????????B-1B???20?????,????????????????????,???????,???????????????????,???????????????????????????????????????????????????????3???????“????????”????????????????????????????

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

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