解颅是指()
A.囟门下陷
B.囟门高突
C.囟门迟闭
D.头形过小
E.头面肿胀
参考答案:C
—May I ask a favor of you?
—______________. [ ]
A. It's my pleasure
B. Sure, go ahead
C. Ask, please
D. I've no time
求函数
的单调区间与极值.