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问题 单项选择题

我国医学伦理学的具体原则

A．实行医学人道主义，全心全意为人民健康服务
B．保持健康和恢复健康
C．救死扶伤，忠于职守；钻研医术，精益求精
D．审慎、保密、良心
E．无伤、有利、公正、自主

答案

参考答案：E

单项选择题

Networks can be interconnected by different devices. In the physical layer, networks can be connected by （66） 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 （67） , 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 （68） 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 （69） . As an example, gateways between Internet e-mail and X.400 e-mail must （70） the e-mail message and change various header fields.

A．reapers

B．relays

C．connectors

D．modems
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单项选择题

能够吸收摄影时人体产生的散射线的是

A．影像增强器
B．高压发生装置
C．遮线器
D．滤线器
E．X线管支架
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