?????????????????!??????|????????

??? ????????? | ??? ???????????????????

?,“?????????????????????,??????”“?????,?”?????

????,??,?????????

????

???????,????

?????????????

??????,??,????????????????,???,????????????

???D,????,?????????????

???????????,????D????,??????????D?????

???????

???????????????????,???????????

?????

1.??

??:??,?????????????????????????????????????,???????????1000~1200?????????????,????????

???D:?D??????????????????,????(?20????????????????????)???D???(????????????????????)???????????

????:???????,?????????,???????????????????????,????,?????????????

2.??????

?????????????:?????????????????????????????????,???,?????????,???????????????,????,???????

??????????:???????????,?????,????????,??

???????????????:????????,????????,?????????????,???????

?????

?????????

????????

??,?????????????????X???????????????(DXA)??????X???,??????????T???????????????=-2.5,???

???????

?????

??

?????????????,??????????????????????,????????????????,????????????,??????,???

??????:?????+???,???????????

?????:?????????????????????????????,????????,?????,???????????????,??????????

?????????????:????????? ?????????