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

2???????

3????????

4??????????

5?????vx

??8????26?? ??????????????????,???????,8?26??14??27??14??????????????,????????????????????????????????????????????????,???,?????????,????(250~260??????????????????????????)?????(?????????????20~50??,?????????????80???????????),??

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

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

1???????;

2???????????,???;

3???,?????,?;

4???????????????,?????

?????:??