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问题 多项选择题

当高层建筑采用瓶装液化石油气作燃料时，应设集中瓶装液化石油气间，并应符合( )规定。

A．应设火灾自动报警系统

B．在总进气管道、总出气管道上应设有紧急事故自动切断阀

C．应设有可燃气体浓度报警装置

D．应设自动喷水灭火系统

答案

参考答案：B,C

单项选择题

通常用于描述一个项目的所有工作任务的图形是（）。

A.A

B.B

C.C

D.D
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单项选择题

Typically, these are concern with the establishment of (66) the network and with the control of the flow of messages across this channel. The provision of such facilities is only part of the network requirements, however, since in many applications the communicating computers may be of different types. This means that they may use different programming languages and, more importantly, different forms of (67) interface between user(application)program, normally referred to, as application processes or APs, and the underlying communication services may be (68) For example, one computer may be a small single -user computer, while another may be a large (69) system. In the earlier days of computer communication, these issues meantthat only closed communities of computers ( that is, from the same manufacturer) could communicate with each other in a meaningful way. IBM’s Systems Network.
Architecture (SNA) and DEC’s Digital Network Architecture (DNA) are just two examples of Communication software packages produced by manufacturers to allow their systems to be int erconnected together. These proprietary packages, however, of which there am still many inexistence, do not address the problem of universal interconnect ability, or open systems interconnection. In an attempt to alleviate this problem, (70) , in the late 1970s, formulated a reference model to provide a common basis ( or the coordination of standards developments and to allow existing and evolving standards activities to beplaced into perspective with one another.

A. DNAB. SNAC. the OSI D. the ISO
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