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题目内容
（郑州工业应用技术学院计算机专业英语）
( ) Most major corporations today use special hardware and software called _______to control access to their internal computer networks.
A.virus checkers
B.firewalls
C.gateways
D.detection programs
A.virus checkers
B.firewalls
C.gateways
D.detection programs
参考答案