单项选择题

Firewall is a（）mechanism used by organizations to protect their LANs from the Internet.

A.reliable
B.stable
C.peaceful
D.security

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单项选择题
Each program module is compiled separately and the resulting（）files are linked together to make an executable application.

A.assembler
B.source
C.library
D.object
单项选择题
Computer（）is a complex consisting of two or more connected computing units, it is used for the purpose of data communication and resource sharing.

A.storage
B.device
C.network
D.processor
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