润滑油的作用是什么？
Refer to the exhibit. Assume Router A is configured for split tunneling. If the Internet Service provider was asked by the customer to provide a guarantee of at least 60 percent of the WAN link between Router A and Router C for encrypted traffic, what would be the best means of identifying this traffic to their QoS Service Policy?（） permit esp any permit udp any eq 500 any eq 500。 permit udp any eq isakmp any eq isakmp。 permit ip 10.81.7.0 0.0.0.7 any。 tcp any any eq 22。
相平衡
Your database is set in NOARCHIVELOG mode and is backed up every night. There are 10 redo log groups on the database， each with three members， making a total of 30 redo log files. At lunchtime the server unexpectedly gets shut down. Upon restarting you notice that the data file belonging to the SYSTEM tablespace has become corrupted. You also notice that there have been 15 log switches during the day. Which solution should you use to recover as much committed data as possible？（） Restore the data file for the SYSTEM tablespace then open the database. 。 Restore all redo logs form last night's backup, then restart the database. 。 Perform a complete restore of all files from last night's backup. Data entered into the database today must be reentered. 。 Mount the instance, take the SYSTEM tablespace offline, open the database, and then restore the data file, recover it, and bring the tablespace online.&e。
同期回路中，当两个同期电压的相位不满足要求时，要使用（）以达到满足（）的目的。
发展经济学在形成时期主要有哪些基本论点（）
