單項選擇題活躍期()

A.規(guī)律宮縮~宮口擴張3cm
B.宮口擴張3cm~宮口擴張8cm
C.宮口擴張3cm~宮口開全
D.規(guī)律宮縮~宮口開全
E.規(guī)律宮縮~宮口擴張8cm