?? ????????
????:1?9???:??????
2??????50?
3?????
4?????600?????
5??????????
??
??,????,????,1970????4?,????,??????????
?
?,????????,???,1972?????12???,???,???
??
?,?,??,1977????5?,????????,???
?????????
??,??,????,1980?8?,??,?????
????:???