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

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Firewall is a （ ） mechanism used by organizations to protect their LANs from the Internet.
A.reliable
B.stable
C.peaceful
D.security

本题关键词:僵a,ECF-A,EP21-A,EP6-A,EP18-A,EP7-A,Lp(a),Lp（a）,A-aDO2,抗A;