人体输血能较安全地开展,是在_____年发现红细胞ABO血型之后。_______年有研究肯定红细胞寿命在120天左右。
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
— ___________________
— Once or twice a week.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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