血型(blood group)
指红细胞膜上的特异性抗原的类型。与临床关系最为密切的是ABO血型系统和Rh血型系统。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
Actually, buyers are the group of people want to buy certain goods or services.
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