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【简答题】
$\lim_{x\to 0} \, \frac{1-\cos (x)}{\sin (x)}$__
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参考答案：
举一反三
【多选题】A node in a red-balck tree could be红黑树节点的颜色有
A.
red 红
B.
black 黑
C.
yellow 黄
D.
blue 蓝
E.
green 绿
F.
purple 紫
【单选题】What does “turn out” imply?
A.
The reason for doing something.
B.
Something happens in that way or has the result the consequence of something.
C.
The potential risk of doing something.
D.
The original plan of doing something.
【单选题】What's unique about red-black trees compared to AVL trees? 红黑树相比于AVL树的特点是：
A.
The balance factor of each node falls within [-1, 1] 每个节点的平衡因子的绝对值不超过1
B.
It is a balanced binary search tree 是平衡二叉搜索树
C.
The search time is O(lgn) 支持O(lgn)时间的查找
D.
The topology changes no more than O(1) after each insertion/deletion每次插入/删除后拓扑结构的变化不超过O(1)
相关题目：
【多选题】A node in a red-balck tree could be红黑树节点的颜色有
A.
red 红
B.
black 黑
C.
yellow 黄
D.
blue 蓝
E.
green 绿
F.
purple 紫
【单选题】What does “turn out” imply?
A.
The reason for doing something.
B.
Something happens in that way or has the result the consequence of something.
C.
The potential risk of doing something.
D.
The original plan of doing something.
【单选题】What's unique about red-black trees compared to AVL trees? 红黑树相比于AVL树的特点是：
A.
The balance factor of each node falls within [-1, 1] 每个节点的平衡因子的绝对值不超过1
B.
It is a balanced binary search tree 是平衡二叉搜索树
C.
The search time is O(lgn) 支持O(lgn)时间的查找
D.
The topology changes no more than O(1) after each insertion/deletion每次插入/删除后拓扑结构的变化不超过O(1)
参考解析：
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