????:1????????:????wx

2??????????

3???????????

4?????vx

5?????????

????????????????????????????????????????????????????????,??????????(29??????)?????

?????????,??0.15%,???,????????????????,?????????????????????1.1%?1.35%?1.55%;???????????????????????????????????????????1.6%?1.8%???1.85%,??????????????????????

?????????,???5-20????,?????????????????2%,????2.1%?

??,????????????????????????????????????????????25?,?,??????????????

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