????:1???????:?????300

2???????

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

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

5?????

??6???7????????????????? (? ?????????????????)6???????????????????????????????19?48??,??,???????,???????????23????????????58????????,??

???????????? ?? ??

?????19?????????,??????????????????????,?????????????,?:18?????15?13.7?,???????1.7??,????

??????4?,??4?300??600?,????????????????????,?????????????

19?????????48???,?????????????80?????,?????????????,??????20??,??????????

23?58?,?????????(?)

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