正确答案: BE

通过MCU实现多点通信 网关可看作H.323设备

题目：关于IP电话系统的描述中，正确的是

解析：BE

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举一反三的答案和解析：

[单选题]监理合同自(29)开始生效。

合同签字之日

解析：解析：监理合同自合同签字之日开始生效。

[单选题]在Outlook窗口中，新邮件的“抄送”文本框输入的多个电子信箱的地址之间，应用______作分隔。

分号(;)

解析：答案：A

[单选题]在项目进度控制中，(28)不适合用于缩短活动工期。

准确确定项目进度的当前状态

解析：当项目的实际进度滞后于计划进度时，首先发现问题，分析问题根源，并找出妥善的解决办法。通常，可采用以下一些方法缩短活动工期：①投入更多的资源以加速活动进程；②指派经验更丰富的人去完成或帮助完成项目工作；③缩减活动范围或降低活动要求；④通过改进技术或方法提高生产效率等。

[多选题]● People are indulging in an illusion whenever they find themselves explaining at a cocktail(鸡尾酒) party, say, that they are "in computers," or "in telecommunications," or "in electronic funds transfer". The implication is that they are part of the high-tech world. Just between us, they usually aren't. The researchers who made fundamental breakthroughs in those areas are in a high-tech business. The rest of us are （71） of their work. We use computers and other new technology components to develop our products or to organize our affairs. Because we go about this work in teams and projects and other tightly knit working groups(紧密联系在一起的工作小组), we are mostly in the human communication business. Our successes stem from good human interactions by all participants in the effort, and our failures stem from poor human interactions.The main reason we tend to focus on the （72） rather than the human side of the work is not because it's more （73） , but because it's easier to do. Getting the new disk drive installed is positively trivial compared to figuring out why Horace is in a blue funk(恐惧) or why Susan is dissatisfied with the company after only a few months. Human interactions are complicated and never very crisp(干脆的,干净利落的) and clean in their effects, but they matter more than any other aspect of the work.

creators

innovators

appliers

technical

classical

social

trivial

crucial

minor

technology

sociology

physiology

technology

sociology

physiology

解析：C,A,B,A,B

[多选题]防火墙配置时应确保服务不开放（）。

Rlogin

NNT

Finger

NFS

解析：答案：ABCD

[单选题]●以下关于网络营销渠道的叙述中，正确的是(44) 。(44)

网络营销渠道不存在多级分销渠道