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问题 选择题

下列各组词语中，没有错别字的一组是

A．轶事   膨胀   不愠不火    囤积居奇

B．葱茏   札记    再接再厉    明火执杖 

C，跳漕   冷僻    颐指气使    有恃无恐

D．陨落   祛除    挑肥拣瘦    以德报怨

答案

D

A不愠不火－不瘟不火  B明火执杖－ 明火执仗  C跳漕－跳槽）

选择题

制作洋葱鳞片叶表皮细胞临时装片时，必须让盖玻片的一侧先接触液滴，然后再缓缓地盖上，其目的是（　　）

A．增强装片的透明度

B．防止水溢出污染装片

C．避免实验材料移动

D．避免盖玻片下出现气泡
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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 (41) 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 (42) , 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 (43) 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 (44) . As an example, gateways between Internet E-mail and X.400 E-mail must (45) the E-mail message and change various header fields.

A．syntax

B．semantics

C．language

D．format
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