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【单选题】
骨盆各平面的形态哪项不正常A.
入口为横椭圆形
B.
中骨盆平面为纵椭圆形
C.
出口在同一平面上
D.
出口平面是两个不同平面的三角形形成的
E.
中骨盆是最小的平面
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B.
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D.
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A.
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B.
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C.
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A.
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A.
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B.
has been to
C.
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D.
has been
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