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:尿TH蛋白,尿TH糖蛋白（THP）,辅助性T细胞(Th),僵a,ECF-A,EP21-A,EP6-A,EP18-A,EP7-A,Lp(a);