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6502电气集中选岔电路中的哪个继电器励磁吸起，能证明整条进路已全部选出？为什么？

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激光切割过程中遇到异常情况按下“急停”按钮关机后，大约需要多长时间才能开机？

Unicast Reverse Path Forwarding can perform all of these actions except which one？（）

A. examine all packets received to make sure that the source addresses and source interfaces appear in the routing table and match the interfaces where the packets were received
B. check to see if any packet received at a router interface arrives on the best return path
C. combine with a configured ACL
D. log its events，if you specify the logging options for the ACL entries used by the unicast rpf command
E. inspect IP packets encapsulated in tunnels， such as GRE

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金属材料的工艺性能包括铸造性可锻性切削性（）等。

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自律机的通用配置文件中（）是通信主程序网络功能配置文件。

A. commhost.cfg
B. commsvc.cfg
C. entity.cfg
D. commlc_comm.cfg

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