(单选题)4: Internet，Intranet，Extranet的主要不同点在于（ ）
A: 基于的协议
B: 实现方法
C: 信息的访问控制和共享机制
D: 参考模型
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1.(单选题)—Hello,thisisJohnspeaking.CouldIspeaktoMike — A.Of course you can. B...
1.(单选题)—Iwouldliketomakeanappointmentforthemeeting.Whichdaywouldyouprefer,Tu...
1.(单选题)—Hey,Derek,whichdoyouthinkishardertolearn,marketingordesigning — A.I...
1.(单选题)—It'srathercoldinhere.DoyoumindifIclosethewindow —________________ A...
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