单项选择题

产妇进入第二产程每次听胎心间隔时间约在

A.18min
B.20min
C.30min
D.40min
E.5～10min
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听力原文：M: Where can I get the perfume wrapped? I bought it as a present.W: Our gift-wrapping department is on the second floor.Q: What's the most probable relationship between them?(18)A.Son and mother.B.Customer and shop assistant.C.Clerk and bossD.Student and teacher.
A.W:
B.
Q:
C.Son
D.
B.Customer
E.
C.Clerk
F.Student
单项选择题
某患者，第一胎，足月顺产，当胎儿娩出后，阴道出血约为500ml，血液呈鲜红色，很快凝成血块，此时胎盘尚未娩出，根据上述情况，考虑出血原因的最大可能是
A.软产道损伤
B.胎盘滞留
C.胎盘残留
D.凝血功能障碍
E.宫缩乏力
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