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

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

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

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

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

????????

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

??

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

?D,??,?????

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

???

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

????

1.?

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

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

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

2.?????????????

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

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

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

????????

??????????

??

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

????????

??????????

???????????

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

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

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

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

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