下列哪一项不是诊断前置胎盘的条件:  A.
膀胱充盈
B.
显示子宫颈内口
C.
观察胎头与子宫颈内口的位置关系
D.
显示胎盘下缘
E.
观察胎盘下缘与子宫颈内口的位置关系

A、5
B、10
C、15
D、20

A．there are two kinds of motor neurons
B．the medial nuclear group supplies the muscles of the limbs
C．the medial nuclear group is prominent in the segments of the cervical and lumbosacral enlargments
D．the lateral nuclear group is almost present in most segments of the spinal cord

A、升高
B、降低
C、不变