正确答案: C

基础电源

题目：通信电源分为（ ）（一次电源）和机架电源（二次电源）。[1分]

解析：C

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学习资料的答案和解析：

[单选题]以下业务中，不属于电话智能网业务的是（）业务。

108

[单选题]下列移动通信业务中， （ ）业务是当前规模最大，用户最多的。

蜂窝移动电话

[多选题]阅读下面的短文，回答问题 [When an IP packet arrives at a router, generally the router looks at the destination address of the packet, and forwards the packet to one of its network interfaces. The forwarding decision is usually done by looking up the destination address from another data structure called a forwarding table. The forwarding table is created by the router using the routing table and possible routing policies existing in the router. The router then creates a table where it lists which networks are accessible through which of the router’s network interfaces. An IP router looks at every IP packet individually and does the forwarding decision on a packet-by-packet basis. If something changes in the router’s routing table, a packet can take a different route from a preceding packet even if it has the same destination.] From the paragraph above，we can see that the router （ ） a forwarding table according to the routing table and possible routing policies existing in the router. When an IP packet arrives at a router, the （ ） part of packet is normally checked by the router. An IP router checks every IP Packet individually and makes the forwarding decision based on （ ）.

is generated

generates A．forwarding table

routing policies

destination address A．the destination address and network interfaces

the destination address and forward table

routing policies and routing table

解析：D,D,C