● 某主机的IP 地址为10.100.100.01/20，其子网掩码是 (70) 。

(70)A. 255.255.248.0 B. 255.255.252.0

C. 255.255.240.0 D. 255.255.255.0

● The line of computing jobs waiting to be run on a computer system might be a (71) . The jobs are serviced in the order of their arrival, that is, the first in is the first out.

(71) A. queue B. stack C. array D. record

● The (72) is a collection of modules serving as interface between hardware and software to provide a software platform.

(72) A. computer B. processor

C. application software D. operating system

● C++ fully supports (73) programming.

(73) A. visual B. object-oriented

C. logic D. natural language

● The Internet is an open system, and most information is available to everyone. It is very important to add (74) to existing system for protecting the secret information.

(74) A. Web pages B. modem C. security D. network

● A (75) system placed between the company network and the outside world may limit outside access to the internal network.

(75) A. firewall B. modem C. gateway D. key

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