???????????????????!????|????????
?????? ????????????????????? | ??? ???????
?????,“?????,?????”“????????,?”??
??,????,??????????
????
???????,?????????
?????
?????????????,???????,??????????,???????????,????
????D,?????????????,???
?????????,???????????D???????????????????,????D??
????????
?????????????,?????????????
?????????
1.??
??????:??,????????????????????????????????,????1000~1200??????????,?????
????D:???D??,?(??????????????????20?)??????????????D???????(???????????????????)?????
???:???????,???????????????,???????????????,??????,????
2.?????
?????????:?????????????????,???,????,?????????,???????????????,?????
??:???????????????,???????????????,????????,????
?????????:???????????????????,?????,?????????,??????
??
?
??????
????,????????????????????X?????????(DXA)?????????????X?????????,?????????T??????=-2.5,?????????
???????????
???
??????
???,????,?????????,??????????????????????????????????,????????,??????
????:??????????+?????????,?????????????????
??????????:?????????????????????????,????????,??????,??????????????????????,???????????????????
????????????:???????????????????????? ???????
????????????:????