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问题 多项选择题

根据《水利水电工程设计防火规范》（SDJ278-1990），安全疏散用的门、走道和楼梯应符合以下要求（）。

A.门净宽不应小于0.9m，并应向疏散反方向开启

B.走道净宽不应小于1.2m

C.楼梯净宽不应小于1.1m，坡度不应大于45°

D.主厂房、泵房机组段之间的楼梯净宽不宜小于0.8m

答案

参考答案：B, C, D

单项选择题

哪项符合轮状病毒肠炎的特点（）。

A.夏季多见

B.>2岁常见

C.大便呈蛋花汤样，无腥臭味

D.感染中毒症状重

E.伴有血便
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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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