??????? ?28???????(????)??
??????2???20? (??????????)???20?,2??1?,??????????????????,?????????28??????????????????????????(??????)??????
2?1?????????????,????????34?,????????????,??,?????????;??7.3?,???0.8???,2?????????????????12?????????????,???????????

?,????,???????????,??,??22?????23??,????????????30?50?,????????20???????30????
????????,????????(???????)?????,??????????????,??????????????,???????,?????????????,???(????????????????)
????:????
??
???:????