防止雷电反击的最有效方法之一是（）。
A. 降低杆塔高度
B. 降低导线悬挂高度
C. 降低接地电阻
D. 增大接地引下线截面
Two directly connected routers， R1 and R2， are both configured for OSPF graceful restart. R2 is able to switch packets in hardware， but R1 is not. If a network administrator logs on to R2 and performs a system reload， which will be the result？（）
A. Traffic forwarded from R2 to or through R1 will continue to be forwarded based on the forwarding table state at the time of the reload.
B. R2 will continue to forward traffic to R1， but R1 will drop the traffic because its neighbor adjacency with R2 has failed.
C. R2 will continue forwarding traffic to and through R1， but R1 will drop this traffic because it is not capable of maintaining its forwarding state.
D. All the traffic R2 is forwarding to or through R1 will be dropped while OSPF rebuilds its neighbor adjacency and forwarding tables.
唐代曾盛行修撰谱牒（记述氏族世系的书籍）638年唐太宗在修《氏族志》时标榜说：“诚欲崇树今朝冠冕„„不论数代已前，只取今日官品、人才作等级。”659年唐高宗改《氏族志》为《姓氏录》，收录姓氏大大少于前者，只限时任五品以上官员。这反映了（）
A. 传统门阀贵族力量遭到一定程度的削弱
B. 唐朝门第观念进一步增强
C. 魏晋以来的世家大族依然保持特权地位
D. 唐朝社会上下流动性减弱
公司法人财产的安全性是公司参与市场竞争的首要条件，是公司作为独立民事主体存在的基础，也是公司作为市场生存和发展主体的必要条件。（）
A. 正确
B. 错误
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