带电气阀门定位器的调节阀校准一般选输入信号4mA、8mA、12mA、16mA、（）mA，5个点进行校准。
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ZPW-2000A型无绝缘移频自动闭塞补偿电容如何设置？
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.
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