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【单选题】
胎盘早剥病人的主要症状是妊娠20后或分娩期突然发生A.
阵发性轻微腹痛伴
B.
持续性阴道出血,血液不凝固
C.
少量阴道出血及子宫颈痉挛狭窄环
D.
无诱因、无痛性反复阴道大出血
E.
腹部持续性疼痛,伴有或不伴有阴道出血
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A.
what
B.
that
C.
which
D.
when
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A.
by asking for permission
B.
without permission
C.
by telling me
D.
with permission
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A.
that; other than
B.
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C.
which; more than
D.
in which; together with
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