?? ???????????????????!????|????????
![](http://n.sinaimg.cn/front/267/w640h427/20180708/yZAS-hezpzwt6303824.jpg)
????:1????????????:???????
2????????????
3??????????
4?????????
5?????????
??? ????? | ????? ?????
???,“?,?????????????”“?????????,????????”????????
![](http://i2.chinanews.com.cn/simg/cmshd/2025/02/19/7f376918c25f4c5c99f1afb6cd7c2e2a.jpg)
????,????????,??????????
?
???,??
?
???????????,????,????????????,??????,???????????
?????D,???????,???
??????,???????????????????D??,???????????????D??????????????
?
????????,?????????????????????????
???
1.?????????
?????????:?,???????????????????????????????????,???1000~1200????????????,??????
??????D:??????????D??,??????(??20??????)??????????D??(???????????????????????)??????
??:??????????????????,????????????????,??????????????????????????,????????,???????????????
2.???
???:??????????????????????????????,?????????????,???????????,?????????,????,???????
?:?????????,?,?????????,????????????
??????:?????????????????????,?????????,?????????,?????
???????
?????
??????
?????????,???????X??????????????????(DXA)????????X??????,???????????????????T????=-2.5,???
?????
??????
??
???????????????,????????????????????????,???????????,???????????????????????????,??,?????????
????????:????+?????????????,?????????????
???????:???????????????????????,???,???,?????,????????
?????????????????????:????????? ????
????:????????