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
A floating constant consists of an integer part，a decimal point，a fraction part，an e or E，and an optionally signed integer ．
A．exponent
B．order
C．superfluous
D．superior
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．1ibrary
D．object
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