Which three statements are true about Source Specific Multicast?()
A. Is best suited for applications that are in the one-to-many category.
B. SSM uses shortest path trees only.
C. The use of SSM is recommended when there are many sources and it is desirable to keep the amount of mroute state in the routers in the network to a.
D. There are no RPs to worry about.
查看答案
若将一段电阻为R的导线均匀拉长至原来的两倍,则其电阻为()。
A. 2R
B. 1/2R
C. 4R
D. 1/4R
挤出机的螺杆工作部份分三段,加料段的螺旋槽是();压缩段的螺旋槽主要是加热;均化段的螺旋槽主要是备料但不挤出。
要在一个单向链表中p所指向的结点之后插入一个s所指向的新结点,若链表中结点的指针域为next,可执行()和p->next=s;的操作。
女婴,1岁,反复患肺炎和心衰。检查:发育营养差,胸骨左缘2~3肋间闻及收缩性杂音,肺动脉第二音亢进,伴震颤。胸部X线检查:肺血多,右房、右室增大,肺动脉段突出。下列病例最可能的诊断是()
A. 法洛四联症
B. 急性心包炎
C. 室间隔缺损
D. 动脉导管未闭
E. 房间隔缺损