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以下()技术不是实现防火墙的主流技术

A、包过滤技术
B、应用级网关技术
C、代理服务器技术
D、nat技术
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正确答案:

D

答案解析:

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A.LakeTahoe.

B.SierraNevada.C.MountWhitney.

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A.About3miles.

D.14,494feet.

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B.SanJoaquinValley.

C.MojaveDesert.

D.OregonandWashington.

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B.ItispossibletogosurfingandsnowskiinginsomepartsofCaliforniawithouthavingtotravellongdistance.

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D.OwensLake,inDeathValley,isnotreallyalakeatall.

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[B]Specificexamples.

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