正确答案:

题目：可用于海事救援通信或车船飞机的移动通信。（ ）

解析：√

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举一反三的答案和解析：

[单选题]电子信箱业务是一种利用（）方式用户提供信函交换的基于计算机通信网的信息传递业务。

存储转发

[单选题]100（）[1分]

IMT-Advanced

[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

[单选题]OSI7层参考模型中，属于通信子网功能的是（）。

物理层、数据链路层、网络层