由新生儿到成人，上颌骨长度增长约为
A．2倍
B．2.5倍
C．3倍
D．3.5倍
E．4倍
参考答案：B
William Sidney Porter, known as O. Henry, is most famous for ______.
A. his poems B. his playsC. his short stories D. his novels
前囟的生长发育规律是什么?前囟发育异常有哪些临床意义?
