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问题 单项选择题

在光纤通信系统中光波、光纤和光电转换器分别作为（）用途.

A.光源、载波、传输媒介

B.光源、传输媒介、光电检测器

C.载波、传输媒介、光源和光电检测器

D.载波、光电检测器、传输媒介

答案

参考答案：C

单项选择题

Rapid advances in computer and communication technologies have resulted in the (71) merger of these two fields. The lines have bluned among computing, switching, and digital transmission equipment, and the same digital techniques are being used for data, voice, and image transmission. Merging and evolving technologies, coupled with increasing demands for efficient and timely collection, processing, and (72) of information, are leading to the development of (73) that transmit and process all types of data. The ultimate goal of this evolution is something its proponents-some of the most powerful forces in the computing and telecommunications industries-call the (74) .The (74) will be a worldwide public telecommunications network that will deliver a wide variety of services. The (74) will be defined by the standardization of user interfaces, and will be implemented as a set of digital switches and paths supporting a broad range of traffic types and providing (75) processing services. Inpractice, there will be multiple networks, implemented within national boundaries, but from the user’s point of view there will be a single, uniformly accessible worldwide network.

A．ISDN

B．OSI

C．DDN

D．DSP
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单项选择题

公司关于现场防洪安全控制工作的规定包括：坚持做到遇下雨即出巡。无论雨量大小和时长，遇雨即安排（）对施工影响区域各个防洪安全风险点全面巡查。

A.职工；

B.劳务负责人；

C.劳务看守。
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