????:1?51???:???????

2?????

3???????3??????

4?????????

5????????

????7?????24?? ?,???7?????24???????18??:???????,7??24????20?????????????25??20?,????????????????????????????????????????????????????????,????,???????????????????????????????????????,??????????(250~800?????)??(?????????30~60?????????????,?????????????80????),????????

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

????:

1???;

2???,????;

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

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

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