慢性骨髓炎迁延不愈,反复发作的最主要原因是
A.窦道的形成
B.死骨的残留
C.瘢痕组织增生
D.机体抵抗力低
E.细菌毒力太强
参考答案:B
---It’s raining! When did it start?
---I don’t know exactly. In fact, it ____ all this afternoon.
A.lasts
B.has lasted
C.lasted
D.will last
正常小儿前囟最迟闭合的时间为()
A.2~3个月
B.4~6个月
C.8个月
D.18个月
E.20个月