凝血酶原酶的组成是 

A、Ⅹa.Ⅴa.\r\nCa_TagUpStart_2+_TagUpEnd_.PF
B、Ⅶ.Ⅲ.Ⅹ.Ⅴ. Ca_TagUpStart_2+_TagUpEnd_.PF
C、Ⅹ.Ⅴ.\r\nCa_TagUpStart_2+_TagUpEnd_.PF
D、Ⅺ.Ⅷ.P
F、\r\nCa_TagUpStart_2+_TagUpEnd_
E、Ⅶa.Ⅲa.\r\nCa_TagUpStart_2+_TagUpEnd_.PF