【名词&注释】
双绞线(twisted-pair)、用户群(user group)、政府机关(government agency)、企事业单位(enterprises and institutions)、专用网(private network)、呼叫转移(call transfer)、移动通信数据业务
[单选题]移动通信数据业务中的查询业务是指用户通过主动定制，以短信形式获取相关信息的业务，用户可查询的内容一般不包括（）
A. 亲情查询
B. 套餐查询
C. 通信质量查询
D. 被叫优惠查询
查看答案&解析
举一反三：
[多选题]CHINAPAC可以提供基本业务功能，还可提供如（）、阻止呼入/呼出业务及呼叫转移(call transfer)等任选业务。
A. 闭合用户群
B. 广播业务
C. 快速选择业务
D. 反向计费业务
[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]固定电话的甲种用户是指（ ）。
A. 政府机关
B. 企事业单位
C. 专用网客户
D. 住宅用户
[单选题]ADSL 将用户双绞线频谱低频部分提供普通电话业务（POTS）信道，通过无源滤波器使其与（ ）分开。
A. 上行信道
B. 下行信道
C. 数字信道
D. 模拟信道
[单选题]在工地堆放机具、材料时，应选择在不妨碍交通、行人少、地面平整的地方堆放，堆积高度不宜超过()。
A. 1m;
B. 1.5m;
C. 2m;
D. 2.5m
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