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问题 单项选择题

以下不是电子银行的特征的是（）。

A.运行环境开放

B.业务实时处理，服务效率高

C.严密的安全系统

D.设立成本高

答案

参考答案：D

解析：网上银行的特征包括：①电子虚拟服务方式；②运行环境开放；③模糊的业务时空界限；④业务实时处理，服务效率高；⑤设立成本低；⑥严密的安全系统。

单项选择题

Networks can be interconnected by different devices in the physical layer networks can be connected by (1) 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 (2) examine the MAC address and forward the frames to a different network while doing minor protocol translation in the process in me network layer, we have routers that can connect two networks, If two networks have (3) 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 (4) . As an example, gateways between Internet e-mail and X.400 e-mail must (5) the e-mail message and change various header fields.

A．frimes

B．packets

C．packages

D．cells
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单项选择题

急性炎症性脱髓鞘性多发性神经病可能与下列哪种细菌感染有关（）

A.大肠杆菌

B.金黄色葡萄球菌

C.空肠弯曲杆菌

D.肺炎双球菌

E.幽门螺旋杆菌
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