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

2?????????

3??????????

4???????vx

5?????????

????????????(???????):????,????????????????,??,???,?????????????

????????????,??????????????3.1????????,???14.7???????????,???????????“????????????????????”????,?????????????????????????6???,????????????????11??????????????????,????2????????,????????????,????????????????,???

??,?????????????????????????????????????????????????????,????????????????,????????110??,??4.54??,??????????????15.1%,????????????1???????,??????,?????1100??,?????1300?????????????????????,??????????990???????????????????????????????????

???:???