【名词&注释】
使用费(user charge)、大客户(major client)、电信业务(telecommunication service)、顺序排列(seriation)、生产专门化(production specialization)
[单选题]按本局记账客户电信业务使用费从大到小的顺序排列，一般省会城市不少于（ ）名、地（市）局不少于50名，作为本局的大客户。
A. 100
B. 90
C. 80
D. 70
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举一反三：
[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]形成市场细分的外在限制条件是进行有效竞争和（ ）。
A. 需求差异
B. 供求失衡
C. 资源的限制
D. 生产专门化(production specialization)
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