21.Infancy physiologic anemia is in： A. 12 days--1 monthB. 1--2 monthsC. 2--3 monthsD. 3--4 months
A、
A、 12 days--1 month;
B、
B、 1--2 months;
C、
C、 2--3 months;
D、
D、 3--4 months
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答案：C. 2--3 months
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