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【单选题】
下列关于胎盘早期剥离的描述正确的是
A.
多发生于妊娠32
B.
重型胎盘早剥是外出血为主，剥离面积不超过1/3
C.
轻型胎盘早剥会造成弥散性血管内凝血（DIC）
D.
指正常位置胎盘在胎儿娩出前从子宫壁剥离
E.
重型胎盘早剥对胎儿无影响
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A.
U O C = 2V R i = 1 Ω
B.
U O C = 2V R i = 0.5 Ω
C.
U O C = 4V R i = 2 Ω
D.
U O C = － 2V R i = 2 Ω
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4V, 0.5Ω
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D.
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A.
U O C = 2V R i = 1 Ω
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B.
They will choose a president in a few months.
C.
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D.
She thinks the appointment will take effect soon.
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