【单选题】【消耗次数：1】
目前常用的网管主要有三类，以下错误的是（ ）。
①
防火墙网关
②
协议网关
③
应用
④
安全网关
参考答案：
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银行金融系统和安全机构之间的接口
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Thats right
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Its very kind of you to say so
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Its my great honor, thanks.
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Thanks. Do you have the time?
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