- 问题详情:In1901,anAustrianscientistdiscoveredthattherearefourtypesofblood.HenamedthemA、B、ABandO.Peoplehaveoneofthesefourtypes.BloodtypeOisthemostcommonaroundtheworld.BloodtypeAisthesecondmostcommon,andbloodtypeABistheleastcommon.In1927,aJapanesedoct...
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