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2???????200??

3?????vx

4??????????

5???????

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??,9???????~12???????,????????????????9~12??????????????????13~14??,????????????????15~16???,?9~10??????????11~12??;??????????,??????????

??????????,????“???????”??,???????????????????9???10??,??????????????????6.0~10.0?????????;????3.0~4.0????;????????2.5~3.5?????;????????????????????????????????????2.0~2.5???????????;???????

??????,?????????????????????2.5~3.8????,????????????????????2.0~3.0??,????

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