?? ?????????????????
????:1???50???????:??????
2?????????
3??????
4???????
5?????????
???1??????????????????29?? (?????????? ???????)??1???????????????29???????,??????????,???????????????????
???,??????????????????????,????????????????????????????,?????
???????????????????????????????,?60?????4????,?????3?????????
?,???21???????????????????????????????????,????????
?23??,????
?????????????2009??,??????????DHC-8??????,???????45??????????????????2?????2????,??????????????1????????(??)
??:????????????