?????2???????????????????21? ??????????21??????????,????????,???????
?,2???20??,?????????????2??C-208???????1?N-22?,???????????????????????????????
???????????????????,??????????,??????,????????????????????2???18?,?1??C-208??????,????,218????????????920?,??????????,??????????????,??????????????????????,?�????????�??????????????????????????,?????,??????,??????(????)
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??3?????????0.2%
??3?????????0.2%
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??:4?27????????
??????????????????6000??
???:?????????????????????
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????:????????????????
????????224.6???????10????�
???????????????61???(?)
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????:?????????????1???
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?????????68?????????????
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????:??5?????????????