????:1?????????:????

2???????

3????????

4????????????

5?????

???????????????6??19??? (?????????? ??)?????????,??????????????????????

19??,?????3.46????????(??,????????????)?,?????????????????

??,????????????????????????????(?????????????)2.13??,??????,??;???????????????(??)0.69????,??????????????,??,???????????????????????????,???;???????0.64?????????????????,??,???????????

???,??4.43??,???

????????????????????,????4.43????,??????????????????????????????????????????????????????????????????????????????????????7???????,?????????????????????????????????,???????????????,????,????(??????????????????????) ???????????:?????