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

2?????vx

3???????

4???????

5?????????????

?????2??????????????5???? (???????? ?)???????????2?5???????,??????????????(1???????28??2????4????????????????????????),???????????????(?)????,?????

?????????????,????????????,?????????????,?4000?????,??28?????

??????,???????????????????????????????????????,???????????10.4????,??????????????????1????????????????????

?,?????????,???(?????????)???????????????????47????????2.7??????????????????????,??110%????????????????????????,????97%,??,????????????????????????????????????????

????,???????????????,??????????????????,??????????????????7.5?,??13.3%?????????????36????5.85?????????????,??????583???????????????????(???????) ???:?????????????????