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问题 单项选择题

近代警察是资本主义发展的产物，发端于( )。

A．法国

B．美国

C．英国

D．西欧

答案

参考答案：D

解析： 近代警察发端于西欧，是资本主义发展的产物，是社会生产力迅速发展和社会分上日益细化的必然结果。

单项选择题

肝素临床不宜用于

A．低血压B．尿结石C．防治血栓形成D．细菌性心内膜炎E．血液透析
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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.

13（）

A.special

B.dependent

C.similar

D.dissimilar
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