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????????B12???B12???????B12?100g?1???????
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???????????????????????DNA???????????????DNA??????????????????????????
???????????????????Wright???????????????????????????????????????J?????????????????
?????????????????B12?????N????????????????????????????
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?????????????????????????????????????1????1.52? ??

?????????????????????????????C???????k?????????? ??B12????????????????????B12 ??50??1030?B12??? ?????????
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??????????????????????????120g/L??110g/L??4.51012/L??4.01012/L??HCT<0.42?<0.37???
????????????????????????????????????????????...