?? ???4.7???? ???????15??
????:1???90????????????:??????
2??????????
3???????????
4?????????100?????
5?????
??11??22??? ?:11?22??20??40?(??????????????23.21?,??120.23?)??????????4.7???????,??15???
???? ??:??????11??22??? ?:11?22??20??40?(??????????????23.21?,??120.23?)??????????4.7???????,??15???
???? ??:????????:1???90????????????:??????
2??????????
3???????????
4?????????100?????
5?????
??11??22??? ?:11?22??20??40?(??????????????23.21?,??120.23?)??????????4.7???????,??15???
???? ??:????