题目内容
Basically, a (71) is a standalone process or a set of integrated processes that runs on a router or server to control the flow of (72) application traffic (73) through it. Typically, firewalls are (74) on the entry point to a public network such as the Internet. They could be considered traffic cops. The firewall’ s (75) is to ensure that all communication between an organization’s network and the Internet conform to the organization’s security policies. 72（）
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Historical research is essential for making inventions.
在窗体上画一个名称为Text1的文本框和一个名称为Command1的命令按钮，然后编写 2如下事件过程：Private Sub Command1_Click() Dim array1(10, 10) As IntegerDim i As Integer, j As IntegerFor i = 1 To 3For j = 2 To 4 array1(i, j) = i + j Next j Next i Text1.Text = array1(2, 3) + array1(3, 4) End Sub程序运行后，单击命令按钮，在文本框中显示的值是______。
若关键字是非负整数，快速排序、归并排序、堆排序和基数排序中 (54) 最快。若要求辅助空间为O(1)，应选 (55) 。 55（）
某种中继设备提供运输层及运输层以上各层之间的协议转换，这种中继设备是 (61) 。从OSI协议层次来看，用以实现不同网络间的地址翻译、协议转换和数据格式转换等功能的路由器属于 (62) 范畴。当采用数据报服务时，负责端到端的流量控制的是 (63) 。路由器的主要功能是 (64) 。下列接人方式中， (65) 不属于ISP的接入方式。 64（）
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