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问题 单项选择题

气源规划是指（）。

A．选择适当的城市气源　

B．确定城市气源规模

C．在城市中合理布局气源考试大　

D．以上皆正确

答案

参考答案：D

解析：

气源规划就是要选择适当的城市气源，确定其规模，并在城市中合理布局气源。

单项选择题

Bluetooth is a universal radio interface in the (1) frequency hand that enables portable electronic devices to connect and communicate wirelessly via short-range, ad hoc networks. Each unit can simultaneously communicate with up to (2) other units per piconet. Moreover, each unit can simultaneously (3) to several piconets. Eliminates the need for wires, cables and connectors for and between cordless or mobile phones, modems, headsets, PDAs, Computers, printers, projectors, local area networks, and so on, and paves the way for new and completely different devices and applications. Technology Characteristics (4) symbol rate exploits maximum available (5) bandwidth。

4（）

A．1Mb/s

B．11Mb/s

C．54Mb/s

D．100Mb/s
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单项选择题

（）是一个对称DES加密系统，它使用一个集中式的专钥密码功能，系统的核心是KDC。

A.TACACS

B.RADIUS

C.Kerberos

D.PKI
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