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问题 单项选择题

择期胃手术一周后腹胀，肠鸣音减弱或无，反复呕吐，首先应采取

A．作胃镜检查，查明原因

B．胃肠减压、支持治疗

C．剖腹检查，解除梗阻

D．输液、补钾

E．肌注阿托品

答案

参考答案：D

单项选择题

不属于价值工程研究的对象是( )。

A．产品寿命周期的长短
B．该产品的用途是什么，成本是多少，
C．该产品体现出的价值是多少
D．有无其他方法可实现同样的功能
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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 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．special

B．dependent

C．similar

D．dissimilar
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