??????? ????????ɡ?ο???????????????????????????????????????????????????????????????????????????????????г??????????????????: ??31??, ??????,??1955???????????????. 80???????????????. ????ü??????????????, ??????????????????.
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2???????? ???????Σ????????????????????????Σ???6??16???????0.2??0.7?????????????????
3????????? ???40??80????,????????,???????????,???????,????????.
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