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

????:1??????????????:?????????
2??????????????
3?????
4?????????
5????????????
?????? ????? | ? ????
????,“????????,??????????????”“???????,????”??????????

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