The engineer hasn’t got time to track down the problem.‘To track down’ means to find out.() 此题为判断题(对，错)。
The engineer hasn’t got time to track down the problem.‘To track down’ means to find out.()
此题为判断题(对，错)。
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It may take some time to get the British economy back on____________. (A) way(B) road(C) track(D) line
命令Backup state-down 3表示(54)。A．第三种备份down状态B．主备份接口切换只能进行3次C．当主接口down状态持续3秒后，切换到备份接口D．当主接口逻辑通道时，如果呼叫3次未成功，则认为主逻辑通道处于down状态
下面哪种说法正确? ()A、当主接口由up 转为down 后,立即切换到备份接口。B、当主接口由down 转为up 后,立即切换回主接口。C、当主接口由up 转为down 后,等待一定时间后,若主接口状态仍为down,才切换到备份接口。D、当主接口由down 转为up 后,等待一定时间后,若主接口状态仍为up,才切换回主接口。
According to RFC 2328, what is the stateful order in which an OSPF router transitions to a full adjacency with a neighbor router?() A. Down, Init, 2 - Way, Exstart, Exchange, Loading, and FullB. Down, Init, 2 - Wa y, Exchange, Exstart, Loading, and FullC. Down, 2 - Way, Init, Loading, Exstart, Exchange, and FullD. Down, 2 - Way, Init, Exchange, Exstart, Loading, and FullE. Down, Init, 2 - Way, Loading, Exstart, Exchange, and FullF. Down, 2 - Way, Init, Exstart, Exch ange, Loading, and Full
下面当主接口由up转为down后哪种说法正确?() A.当主接口由up转为down后，立即切换到备份接口。B.当主接口由down转为up后，立即切换回主接口。C.当主接口由up转为down后，等待一定时间后，若主接口状态仍为down，才切换到备份接口。D.当主接口由down转为up后，等待一定时间后，若主接口状态仍为up，才切换回主接口。
命令Backupstate－down5表示() A.第5种备份down状态B.主备份接口切换只能进行5次C.当主接口down状态持续5秒后，切换到备份接口D.当主接口逻辑通道时，如果呼叫5次未成功，则认为主逻辑通道处于down状态
In 17th-century England, astronomy provided methods of keeping______of time that were especially useful for accurate navigation.A.investigateB.traceC.checkD.track