题目内容
百白破疫苗的基础免疫需要注射( )。
2021-10-11
A.2次,每次间隔1个月
B.2次,每次间隔2个月
C.3次,每次间隔1个月
D.3次,每次间隔2个月
E.4次,每次间隔1个月
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