?? ?????????????
????:1??????????:????
2???????
3?????????????
4?????
5??????????
??6??19? (????? ??)????????????????,????????????????????????????
19??????????,?????????????3.46???????????????(??,?????????????????)??,???????????????
????,??????????????????????(????)2.13??????????,??,???????????????;????????????????????(????)0.69???????????????,????,??????????????????,??????????,??????????????;????????0.64?????????,??,???????????????????????
???????,??????4.43?????????????????,??????????????
??????,???????????4.43????,??????????????????????????????????????????????7??,??????????,???????????????????,????,?????????????????(???) ???:?????????