????:1?????vx?:?????200??500

2?????

3?????

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

5?????????

????????8??6?????? (?????????????? ?)??????????????6????????????,??6??8?,????????????????????????100~150????

??,5??,?????????????????

??,?????????6???????????????,??,??????????????????;7????????????????????,??????????????????;8??????????,???????????????????????????(30~50?????????),????????(60~90??)?

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