移动电话呼叫前转包括（）。

【名词&注释】

逆变器(inverter)、整流器(rectifier)、接入网(access network)、移动电话(mobile phone)、正弦波(sine wave)、无应答(non-response)、无条件(unconditional)、不间断供电(uninterrupted power supply)

[多选题]移动电话呼叫前转包括（）。

A. 无条件^{(unconditional)}前转
B. 遇忙前转
C. 无应答^{(non-response)}前转
D. 不可及前转

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学习资料：

[多选题]UPS电源由（）等组件构成。

A. 整流模块
B. 逆变器
C. 蓄电池
D. 静态开关

[多选题]不间断供电^{(uninterrupted power supply)}电源系统采用市电经（）供给380/220V交流50Hz正弦波稳压稳频电源。

A. 整流器
B. 逆变器
C. 变压器
D. 蓄电池

[单选题]接入网主要分为有线接入网和（ ）接入网

A. 铜线
B. 光纤
C. 无线
D. 卫星

[多选题]阅读以下短文，回答98-100题。 【IPv6 is not interoperable with IPv4，In essence.it establishes a parallel version of the Internet not directly accessible with IPv4 sofeware.This means softwate upgrades or translator facilities are necessary for networking devices that need to communicate on both networks.Most modern computer operating systems already support both versions of the Internet Protocal.Network infrastrutures，however，are still lagging in this development.Aside form the complex array of physical connections that make up its infrastrure，the Internet is facilitated by bi- or multi-lateral commercial contracts(e.g. pearing agreements)，and by technical spesifications or protocals that describe how to exchange data over the network.Indeed，the Internet is defined by its interconnections and routing policies.】 Based on the paragraph above， it is shown that in order to deploy IPv6 protocol on the Internet，（）has to be built. The network devices which need to communicate with both networks are required to have upgraded software or （）in the movement of IPv4 to IPv6 transition，（）are relatively slow in this event.

A. separated network
B. mobile network
C. access network
D. radio network
E. IPv6 software B．translator facilities C．operating systems D．IPv4 software

[单选题]ICIC是()的干扰规避:

A. 时域
B. 频域
C. 空域
D. 码域

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