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

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

3?????????

4?????????

5???????

????2???????????????????5????????(????????? ?)2?5?,??60?????,????????????????,??????

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

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

??,????????1000?????????????????????????,?10.3??????,???12?????,??,??,??????????,??????

????????? ?

???????,????????????40????????????????????20???,???60??????(?????)

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