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问题 单项选择题

下列关于需求规律，表述错误的是（）。

A.在其他条件不变的情况下，某商品的需求量与该商品价格之间呈反方向变动

B.需求量随商品本身价格的下降而增加

C.需求量随商品本身价格的上升而增加

D.需求量随商品本身价格的上升而减少

答案

参考答案：C

单项选择题

Networks can be interconnected by different devices. In the physical layer, networks can be connected by. (31) 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 (32) , 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 (33) 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 (34) . As an example, gateways between Internet E-mail and X. 400 e-mail must (35) the e-mail message and change various header fields.

（32）是（）

A.frames

B.packets

C.packages

D.cells
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名词解释

透热转气
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