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[单选题]
预防佝偻病服用维生素D,新生儿通常开始于出生后:()
A.2周
B.3周
C.4--5周
D.6—7周
E.8—9周
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A.2周
B.3周
C.4--5周
D.6—7周
E.8—9周
A.1~2周
B.2~3周
C.4~5周
D.6~7周
E.8~9周
A.100IU
B.200IU
C.300IU
D.400IU
E.800IU
A.出生后1周起
B.出生后2周起
C.出生后4周起
D.出生后3个月起
E.出生后10个月起
A.100IU
B.200IU
C.300IU
D.400IU
E.800IU
A.400~600U/d
B.700~900U/d
C.800~1 000U/d
D.5 000~10 000U/d
E.10 000~20 000U/d
A.400IU
B.1000IU
C.1500IU
D.2000IU
E.3000IU