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问题 单项选择题

A．桌子上
B．床上
C．书架上

答案

参考答案：A

解析：[听力原文]
女：小明，把桌子上的书放回到书架上吧。
男：妈妈，我还没看完呢，看完了就放回去。
问：现在书在哪里

单项选择题

Networks can be interconnected by different devices. In the physical layer, networks can be connected by （66） 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 （67） , 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 （68） network layer, the router may be able to translate between the packet 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 （69） . As an example, gateways between Internet e-mail and X.400 e-mail must （70） the e-mail message and change various header fields.

（75）处填（）。

A．detailed

B．outlined

C．total

D．complete
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填空题

按机器人的应用分类，可分为（）、极限作业机器人和娱乐机器人。
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