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问题 单项选择题

《学记》提出：“化民成俗，其必由学…‘建国君民，教学为先”，揭示了教育的重要性和教育与()的关系。

A．宗教

B．经济

C．生产力

D．政治

答案

参考答案：D

解析：题于中的“化民成俗”和“建国君民”都是指治理国家和管理人民，是属于“政治”这个范畴内的概念，这两句话都阐述了政治与教育的关系。

单项选择题

假回声产生的主要途径是()

A．反射

B．衍射

C．多重反射

D．递减

E．折射
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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.

11（）

A.repeaters

B.relays

C.packages

D.modems
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