皮皮学，免费搜题
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【单选题】
下列关于防火墙技术的描述中，错误的是( )。A.
可以支持网络地址转换
B.
可以保护脆弱的服务
C.
可以查、杀各种病毒
D.
可以增强保密性
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】When hyperinflation forces Emily to visit her bank very frequently to keep her cash holdings to a minimum, economists say that Emily has a:
A.
shoe-leather cost.
B.
menu cost.
C.
unit-of-account cost.
D.
Fisher effect.
【单选题】Hyperinflation is most likely when it is fueled by
A.
ever-increasing levels of government spending.
B.
declines in the velocity of money.
C.
continuously rising money demand.
D.
continuous increases in the money supply inever-increasing volume.
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