关于狭颅症常见病因正确的是()
A.产后颅内出血
B.感染
C.颅缝延迟闭合
D.各种脑膜炎
E.原因不明
参考答案:E
The shy girl felt ______ and uncomfortable when she could not answer her teacher's questions.
A.amazed
B.awkward
C.curious
D.amused
成功点解氢氧化钠得到金属钠的事哪位科学家()