单项选择题
A.妊娠2个月以内 B.妊娠2～3个月 C.妊娠4～6个月 D.妊娠7～8个月 E.生产以后
A.10s B.30s C.40s D.50s E.60s
A.2个月以后 B.4个月以后 C.6个月以后 D.8个月以后 E.10个月以后
A.80 B.90 C.100 D.110 E.120
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