A.妊娠2個月以內 B.妊娠2~3個月 C.妊娠4~6個月 D.妊娠7~8個月 E.生產以后
A.10s B.30s C.40s D.50s E.60s
A.2個月以后 B.4個月以后 C.6個月以后 D.8個月以后 E.10個月以后