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问题 单项选择题

患者，女性，35岁，主诉腹胀，4天未排便，触诊腹部较硬且紧张，可触及包块，肛诊可触及粪块。

为该患者提供的最主要的护理措施是

A．清洁灌肠

B．保留灌肠

C．调整排便姿势

D．腹部环形按摩

E．大量不保留灌肠

答案

参考答案：E

填空题

小圆的半径是2厘米，大圆的半径是7厘米，大圆面积和小圆面积的比是______．
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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 (66) or Hubs, which just move the bits from one network to an identical net-work. One layer up we find bridgas and swiehes, 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 netwoks. 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 the 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．frames

B．bytes

C．packages

D．cells
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