It is reported that no problems have been discovered in milk products such as Yili, Sanlu and Mengniu, ________ proves newly-produced liquid milk safe.

A．that

B．what

C．which

D．where

正常分娩时下列不正确的是（）。

A.在骨盆最 * * 面上胎头矢状缝与横径一致

B.以枕颏径进入骨盆最 * * 面

C.胎头在进入出口平面前开始仰伸

D.胎头进入中骨盆平面继续俯屈

E.胎头着冠时取枕下前囟径娩出