Your firm has been recommended to us by the James Olivier & Co. ____ we have done business for many years

在Internet中，主机的域名结构应为（）

The consignment certainly does not match the samples ____ you sent us last month.

防火墙的设置主要是为了防范（）

We ____ some brochures ____ to illustrate the types of materials we manufacture.

下面有关TCP/IP哪一个是正确的（）

计算机病毒是指（）

We have made ____ that we would accept terms for your present order. 

在WORD的编辑状态,可以显示页面四角的视图方式是（）

计算机操作系统的作用是()