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

2????????

3??????????

4??????

5????????

??(?????):??????????????????????(2????14??)?????????,?????????1?,???,??????

????,1???,??????M2??????????????318.52???????????,??7%,????????;1??,???7.06???????????,?????????????????5.13????

?????????,???????????????12.7%????????????11.4%,??????????????“????”“???????”???????????,??

1?????????,??????3.4%,??????????????0.4?,???????????????????,?????????,????? ??:?????