??

???
[?]
??????1960????????2???2?3??????????????????????????????1964???64.3%12??1975??10.6%?1974???33.9%?3??1976??9.7%1975?????????0.84.2%
[?]
?
[?]??
??????
[?]?
1.? ????????????????????
2.?
[?]?
????????v????????????
[?]??
?
1????????????
2????????
3???
4??????
5?????????
6???????????
?????????
???...

???????????????????????????????sitanjihe

?????~
??????~
CDFI????????
?0.60.4m??????1.41.0cm0.50.5cm??????
?
?????????????
???
 

1??????2???????3???????????????????
??????????????????????????????????????????????????50-100g???160-200g???????????????
?
       1???????
2??????????
340????????????????
4???????????????????

??
1????????????
2?????????
3??????????????????????
????????88.2%????????????????????????????????????

1??????2???????3????????????????????

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