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问题 选择题

You_______that mistake；you were too careless．

A．should not make

B．should not have made

C．ought not have made

D．must not have made

答案

B

判断题

课程设计是集群式模块课程开发的中心环节，也是其中最富创造性的环节，它包括“宽基础”课程的设置和“活模块”课程的设置两部分。( )
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单项选择题

A multicast router may receive thousands of multicast（）every day for different groups. If a router has no knowledge about the membership status of the（）, it must broadcast all of these packets. This creates a lot of traffic and consumes（）. A better solution is to keep a list of groups in the network for which there is at least one loyal member.（）helps the multicast router create and update this list. For each group, there is one router that has the duty of distributing the（）packets destined for that group. This means that if there are three multicast routers connected to a network, their lists of groupids are mutually exclusive. A host or multicast router can have membership in a group.

（）helps the multicast router create and update this list.

A．ICMP

B．IGMP

C．OSPF

D．RIP
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