Refer to the exhibit. EIGRP has been configured on routers R1 and R2. However， R1 does notshow R2 as a neighbor and does not accept routing updates from R2. What could be the cause ofthe problem？（）
A. The no auto-summary command has not been issued under the EIGRP process on bothrouters
B. Interface E0 on router R1 has not been configured with a secondary IP address of 10.1.2.1/24
C. EIGRP cannot exchange routing updates with a neighbor’s router interface that is configuredwith two IP addresses
D. EIGRP cannot form neighbor relationship and exchange routing updates with a secondaryaddress
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下列关于重点调查和典型调查的说法中，正确的是（）。
A. 可以利用典型调查资料对调查总体进行较为准确的数量推断
B. 重点调查同样可以计算抽样误差
C. 普查方式在市场分析中应用最为广泛
D. 重点调查和典型调查也属于抽样调查
逐步结转分配法的优点是（）。
A. 简化和加速了成本计算工作，不必进行成本还原
B. 能够提供各步骤半成品成本资料
C. 能够为半成品和在产品的实物管理及资金管理提供数据
D. 能够反映各步骤所耗上步骤半成品费用和本步骤加工费，有利于各步骤的成本管理
E. 有利于开展成本分析工作
FromtheperspectiveofrouterPG-1，whatkindofrouteristherouterwithIPaddress192.23.1.1（）
ApeerrouterrunningIBGP
B. ApeerrouterrunningEBGP
C. AcommunitymemberrunningIBGP
D. ApeergroupmemberrunningIBGP
E. ApeergroupmemberrunningEBGP
下述哪项不是HBV的结构成分（）
A. HBsAg
B. HBcAg
C. HBeAg
D. HBV-DNA
E. HBV-DNAp
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