问题
单项选择题
A （）system placed between the company network and the outside world may limit outside access to the internal network.
A．firewall
B．modem
C．gateway
D．key
答案
参考答案：A
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A （）system placed between the company network and the outside world may limit outside access to the internal network.
A．firewall
B．modem
C．gateway
D．key
参考答案：A