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

2????????????

3?????????

4??????????

5??????????

??6??18??????????(??? ?????)?18??????????,?????,???????????19?????????

???????,?,???,??????,?????????????;??????

?????????(?????????????)?? ? ????????

???????????????,????????300??~500????,???(??256??);???????????,???????150???~200?????????,?????

?????,??7??,??????????(??)

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