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【单选题】
枕先露肛查胎头下降程度为+2是指A.
胎头双顶径在坐骨棘平面下2cm
B.
胎头最低点在坐骨结节平面下2cm
C.
胎头颅骨最低点在坐骨棘平面下2cm
D.
胎头顶骨在坐骨棘平面上2cm
E.
胎头顶骨在坐骨结节平面上2cm
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A.
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B.
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