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

2??????

3?????vx?

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

5?????????

????????????,??????,?,???

?? ?????????????:????????????????,????,???????????,??,?????????????,???,??????,??????,???,???????20%?

??? ????:7?????????????5?????????,???? ??????(?????????????)????????????4000??????,????????80%??????????,???????3000??????????4000????

??? ????????????:?????????????,?????????????,???????????????,????5????180???????,???????????,??,???????????????,????3???5???????????

?????? ?:??200?????????????,????(????)??,??????????????????,???????

???,7?????????????????,???????????40% ??,???????????????????90%;????????????????????????85%?????,????

???:?????????