????????????????,????????????,?????????????,???????????????1/2,????1/4,????2/3(???1/3?????????)

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

1??????,????????????,??90~500???????????

2?-25?????,????25???????????,???????????????????

3????,??????????????????,????????????

4????????,????,??????????????????,??????????,???????,?????

5????,?????????????,????,????

6?????,??????????,?????

7????,?????,????

8??????,??????,?????,??,??,???

????:??????????????,??????