A.宮縮5~6分鐘1次,持續(xù)30秒到宮口開全 B.宮口擴張,宮縮10~15分鐘1次,持續(xù)40秒,到宮口開全 C.宮口擴張到宮口開全至胎兒娩出 D.規(guī)律宮縮,宮口開全,胎兒娩出,胎盤娩出 E.宮口擴張到宮口開大3cm