单项选择题

A．execute
B．．interpret
C．compile
D．maintain
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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
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
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