新生儿败血症，医源性感染常见的致病菌为（）
A.葡萄球菌
B.大肠杆菌
C.铜绿假单胞菌
D.衣原体
E.B组链球菌
参考答案：C
Only after liberation（解放） to be treated as human beings.
A．did they begin
B．they had begun
C．they did begin
D．has they begun
地下埋管的破坏事故多数由外压失稳造成。
