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

2??????

3???????600?1200

4??????

5??????

?????2?18??????? (? ?????????????????)?????????18?????????????????,?????????????7?????????????????????,??

??17??????????????????????????16??????????????????????????50?,???,7????????????????????????????????,???????,??

??????????????,???,????

18?????,??,???

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