关于子宫收缩异常，下列哪一项不正确() ["A．协调性宫缩乏力","B．生理性宫缩变弱","C．痉挛性宫缩变弱","D．原发性宫缩乏力","E．不协调性宫缩乏力"]
关于肩先露，下列不正确的是() ["A．胎体纵轴与母体纵轴相垂直","B．容易发生脐带脱垂和胎膜早破","C．容易发生病理性缩复环","D．第二产程发现为横位立即行阴道助产","E．腹部检查时，子宫呈横椭圆形"]
协调性子宫收缩乏力，宫颈扩张5cm，未破膜，无头盆不称，首选处理措施为() ["A．人工破膜后酌情静滴缩宫素","B．等待产程自然进展","C．缩宫素静滴","D．剖宫产","E．应用地西泮"]
光传送网（otn）特点？
中骨盆狭窄时主要临床表现为() ["A．胎头跨耻征阳性","B．持续性枕后位或枕横位","C．脐带脱垂","D．胎位异常","E．胎先露入盆受阻"]
otn(光传送网)的分层结构由上至下依次为：_________、_________、_________
