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问题 单项选择题

江苏省高校招生就业指导服务中心“专家在线”咨询平台是（）。

A.www.91joB.gov.cn

B.www.91joB.com.cn

C.www.eC.js.edu.cn

D.www.3ideA.com.cn

答案

参考答案：A

单项选择题

Networks can be interconnected by different devices. In the physical layer, networks can be connected by (11) or hubs, which just move the bits from one network to an identical network. One layer up we find bridges and switches, which operate at data link layer. They can accept (12) ,examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer, we have routers that can connect two networks. If two networks have (13) network layer, the router may be able to translate between the packer formats. In the transport layer we find transport gateway, which can interface between two transport connections. Finally, in the application layer, application gateways translate message (14) . As an example, gateways between Internet e-mail and X.400 e-mail must (15) the e-mail message and change various header fields.

（12）是（）

A.frames

B.packets

C.packages

D.cells
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判断题

土地增值税的纳税人为转让土地使用权、地上的建筑物及其附着物并取得收入的单位和个人。 ( )
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