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

2???????

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

4?????600

5?????????

???????2??17???????????? (???????????? ??????????????????)????????17??,???????,2??13???16?,???????????????????,????????72???15.3?,???????????;????????????????????????????10????????????????????48???????6.5?~10.9????????,??????????;???????????????4????

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

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

????2?18?????2?22???????????,?????,???????????,???2??????????19??2????????20?,??????????,?????,?????????????,???????????,??(?)

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