??????????????????????????????????????????????????????????????????????????????????????OSSD?????????????????????????????????????????????????????????
OSSD?????????????????????????????????
1. ????–????
OSSD???????80%~90%
?????????? QS?????254? ???????6.5
?????????10?????4???????????8~10????
2. ????–????????
OSSD???????70%~80%
??????????QS?????137????????6.5
?????????4~6 ?????3???????????4~6????
