产后出血最常见的原因是
A．子宫颈裂伤
B．胎盘部分剥离
C．.胎盘残留
D．子宫收缩乏力
E．凝血机制障碍
参考答案：D
It was difficult to get a word in. Everyone _____ so excitedly about the play.[ ]
A. would talk
B. was talking
C. talked
D. had talked
勘验、检查的情况应当写成笔录，由参加勘验、检查的人和（）签名或者盖章。
A、见证人
B、当事人
C、旁观的人
D、证人
