????:1?????????:?????vx

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

3??????????

4??????????

5??????599??

????2??18?? ???18???,1????,???????????3.69??????,??????????12.1%?

??,???????????,?????????????,?????????2.75????,????74.6%,??10.6%??????????1446.17????,???????????17.6%,????971??,?????18.9%?

???,1??,????4.23?????,?2884.72??????????,?????3.27?,???2664.89????????,??????????????0.77????0.48????????????,????10.9%????17.5%?

?????????????,1???????????,?439?,??3.7%,?????18.3?????(?) ????:?????????