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

2??????????150

3???100??????

4??????????

5?????????

???2????21????????????????? (??????????????????? ??)2?21?,???,???????????????????????????????????????????;???????????????????????????

?,?????????,1977??11???,????????????????,?????

?,1973?5????,?????,????????????????????,????

??????,1971?????2?????????????,??????????????????????????????,??????(??) ??????:?????????????????????????