????:1???????vx:??????????

2?????

3?????

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

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

??????????????????6?????????17?? (?? ????)??17?????,??????????,?6??????????????????????18??,??,??

???,??“????????????????”??????6????15???????,???????????,????,?,??????“????”??

??,?????????????,19???20????????21???24?,?????????????????,??150~250???,??????400???????

?,18????????,??;19?????????20?,???????????????????????????????????????????????????????,??(?40~90??)???(8~11?????????)??;21???????24????????,??????????????,???19????20??????,???

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