（）is not a physical wall, but a lot of virtual data to protect the computer network.<br>A:Data wall <br>B:Data Channel <br>C:Data base <br>D:firewall

（）is not a physical wall, but a lot of virtual data to protect the computer network.
A:Data wall
B:Data Channel
C:Data base
D:firewall

出自：物流员（国家职业资格四级）

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