题目内容

某个网络中包含200台主机，采用什么子网掩码可以把这些主机置于同一个子网中而且不浪费地址？（41）

A. 255.255.248.0
B. 255.255.252.0
C. 255.255.254.0
D. 255.255.255.0

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在一棵非空二叉排序树中，关键字最小的结点的（41）。

A. 左子树一定为空、右子树不一定为空
B. 左子树不一定为空、右子树一定为空
C. 左子树和右子树一定都为空
D. 左子树和右子树一定都不为空

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