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问题 填空题

绕______三角形的一条直角边旋转可以得到一个圆锥，这条边是圆锥的______，另一条直角边是圆锥的______．

答案

绕直角三角形的一条直角边旋转可以得到一个圆锥，这条边是圆锥的高，另一条直角边是圆锥的底面半径．

故答案为：直角，高，底面半径．

单项选择题

工程项目风险管理首先必须（），这是项目风险管理中最重要的步骤。

A.采集风险信息

B.对风险进行假设分析

C.识别和分析评估潜在的风险领域

D.制订风险应对计划
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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. same B. similar C. different D. dependent
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