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保管自然损耗指哪些内容？

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水泵按工作原理可分为哪几类？

You have just completed an OSPF implementation. While executing your verification plan, you determine that R1 is not able to establish full OSPF adjacency with R2. The show ip ospf neighbor comman d output on R1 shows that R2 is stuck in the INIT state. What could be the cause of this problem?（）

A. DR and BDR election errors between R1 and R2.
B. The R2 router has not received the OSPF hello packets from the R1 router.
C. Mismatched interface ma ximum transmission unit (MTU) configuration between the R1 and R2.
D. Mismatched OSPF hello interval configuration between the R1 and R2
E. Corrupted LSAs exchanges between the R1 and R2.

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针对老客户设计的FAQ，主要提供（）。

A. 产品和服务特征的FAQ
B. 新产品使用的FAQ
C. 维修信息的FAQ
D. 技术改进信息的FAQ

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对胫骨的描述，除哪一项外都是正确的（）

A. 胫骨上端由内外侧髁
B. 内侧髁的后下方有一腓关节面
C. 胫骨下端内髁的外面有一内髁关节面
D. 胫骨下端下面有一关节面

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