单项选择题

A floating constant consists of an integer part,a decimal point,afraction part, an e or E, and an optionally signed integer（）.

A.exponent
B.order
C.superfluous
D.superior

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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
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
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