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问题 单项选择题

按照《招标投标法》的规定，招标代理机构是依法设立、从事招标代理业务并提供相关服务的（）。

A.事业单位组织

B.社会中介组织

C.行政机构

D.企业内部组织

答案

参考答案：B

单项选择题 A1/A2型题

推荐尿液常规分析保存的最佳方法是（）

A.甲醛

B.甲苯

C.麝香草酚

D.戊二醛

E.冷藏法
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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.

12（）

A.frames

B.packets

C.packages

D.cells
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