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