单项选择题
母体血容量自妊娠6周开始增加,至妊娠多少周达高峰( )
A.28~30周
B.30~32周
C.32~34周
D.34~36周
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单项选择题
胎盘的最内层是( )
A.包蜕膜
B.羊膜
C.叶状绒毛膜
D.底蜕膜
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单项选择题
After admitting she still loves him,she ()asks him to leave.
A.nonetheless
B.anyway
C.however
D.though
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