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

2????????

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

4??????????

5??????????

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

??????????,?????????????,????60%???????????,????,??????

??????????,?????????1800?????????????????6????6??????????,???????6??????????

?????????????,??????????????????,?????????????????,??????????????????800???????

???????????,?????????????????????????,??,??????????????21???????

6???????15????????,??????,???,?????????????????????????,????????????????????????,?????????????????74????????????????85%??????????????????

?????(6?16?????????)????,??417??,?????13????????????????,?????????,???????? ???????:??????????