在井巷工程贯通前，测量业务部门必须按规定的安全距离和时间下达贯通通知书。
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某相电极电流突然减小，并听到打弧声，则这时该相电极可能（），应立即（）。
调车联控基本原则为（）。
A. 指路调车
B. 问路调车
C. 看路调车
D. 联系调车
n your Cisco EIGRP network， you notice that the neighbor relationship between two of your routers was recently restarted. Which two of these choices could have made this occur？（）
An update packet with init flag set from a known， already established neighbor relationship was received by one of the routers.
B. The ARP cache was cleared.
C. The counters were cleared.
D. The IP EIGRP neighbor relationship was cleared manually.
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