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

2??????????

3??????????

4?????wx

5??????????

????????????????1??7???????????????? (?????????????? ?????)?????,7??????????????????,????(?“?????????”)B737?????,????????????????????1000????,?2??????,????????????,????

7??,????????????????(????????????????????)

???,???????????????????5?,??????????????????????????????????,??,?????????????????????????????????????????“???????????”?

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

???:???????