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

2??????????

3?????????

4?????1000

5?????t???

???????????,???12???????????????????1???????,???????,????????“????????????????”??,?,?????,????4??11?????????,12?????????????????????????3?????,??????,????

??4??1??,??,?????????????????????5???????????????10?????????????,???1.1?,??????4.09????????,???42.6%?72.7%,?????

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