民族共同语的形成，普通话的推广、并不以方言的消亡作为前提。
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Routers R1 and R2 are EIGRP neighbors. R1 has been configured with the eigrp stub connected command. Which of the following is true as a result？（）
A. R1 can learn EIGRP routes from R2, but R2 cannot learn EIGRP routes from R1
B. R1 can send IP packets to R2, but R2 cannot send IP packets to R1
C. R2 no longer learns EIGRP routes from R1 for routes not connected to R1
D. R1 no longer replies to R2's Query messages
E. R2n o longer sends to R1 Query message
整个建筑物的接地系统，可能包括（）接地。
A. 防雷
B. 工作
C. 保护
D. 抗干扰
E. 防震
拟评估某快速变现资产，在评估时点与其完全相同的正常变现价格为25万元，经评估师综合分析，认为其快速变现的折扣率为45%，求快速变现资产的价值。
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