In1901,anAustrianscientistdiscoveredthattherearefourtyp...
問題詳情：In1901,anAustrianscientistdiscoveredthattherearefourtypesofblood.HenamedthemA、B、ABandO.Peoplehaveoneofthesefourtypes.BloodtypeOisthemostcommonaroundtheworld.BloodtypeAisthesecondmostcommon,a...