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