在完全二叉树的顺序存储中，若节点有左子女，则其左子女是节点 【9】 。
二叉树是节点的有限集合，这个有限集合或者为 【11】 ，或者由一个根节点及两棵不相交的、分别称为根的左子树和右子树的二叉树组成。
Where does this conversation most probably take place
A. He was not born in Beijing.
B. His parents like Beijing better than he does.
C. Beijing is the place where his parents were born.
强直性脊柱炎
A. 脊椎呈“竹节”样
B. 骨摸反应呈三角形
C. 骨端膨胀呈肥皂泡样
D. 长管骨干骺区有骨性疣状突起
E. 有死骨形成并有包壳
F. 请指出下列疾病的特征性X线片变化
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