( ) 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

( ) 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

出自：郑州工业应用技术学院计算机专业英语

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