ZPW-2000A型无绝缘移频自动闭塞补偿电容如何设置?
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自动变速器中有实现无级变速能力的组成部分是()。
A. 液力变矩器
B. 电子控制系统
C. 换挡执行机构
D. 液压控制系统
Host 1 is trying to communicate with Host 2. The e0 interface on Router C is down. Which of the following are true?()
A. Router C will use ICMP to inform Host 1 that Host 2 cannot be reached.
B. Router C will use ICMP to inform Router B that Host 2 cannot be reached.
C. Router C will use ICMP to inform Host 1, Router A, and Router B that Host 2 cannot be reached.
D. Router C will send a Destination Unreachable message type.
E. Router C will send a Router Selection message type.
F. Router C will send a Source Quench message type.
水利工程中的永久性水工建筑物,根据其所属工程的等别及其在工程中的重要性划分为5级。工程等别为Ⅰ等时,其主要建筑物及次要建筑物的级别分别为()级。
A. 1和3
B. 2和3
C. 1和4
D. 2和4