【名词&注释】
服务质量(qos)、差异性(difference)、及时性(betimes)、蓄电池组(battery)、急救中心(first-aid center)、不可分割性(indivisibility)、警察局(police station)
[单选题]阀控铅蓄电池组在放出电量超过（ D）以上额定容量应进行均衡充电。
A. 50%
B. 40%
C. 30%
D. 20%
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举一反三：
[单选题]更软切换是指在（）之间的信道切换。
A. 不同小区的扇区
B. 同一小区内的扇区
C. 不同载波频率的小区
D. 相同载波频率的小区
[单选题]服务不能像有形产品那样实现标准化，每次服务带给顾客的效用、顾客感知的服务质量都会有不同，这是描述服务的（ ）
A. 无形性
B. 差异性
C. 及时性
D. 不可分割性(indivisibility)
[单选题]()是限制将主叫号码送给被叫方
A. 主叫线识别限制
B. 主叫线识别提供
C. 呼叫前转
[单选题]联网型应急通信业务911号业务归()管.
A. 应急通信业务局
B. 警察局(police station)
C. 急救中心
[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
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