我国古代自秦汉以来中央和地方管制演变的基本趋势是（）。①消弱地方，加强中央②消弱相权，加强君权③对边疆地区的管辖和治理日趋严密④逐渐强化对地方官吏的控制和监视 ①②③④。 ①②③。 ②③④。 ①②③。
Which two features are added when upgrading from IPCC Express Standard to Enhanced? （） Agent Routing 。 Historical Reporting 。 Conditional Routing 。 Prioritized Queueing 。 Agent Queueing。
请简述程序设计的一般步骤。
You just completed a manual open database backup. However there seems to be a problem with the database performance. You discover that the database is generating many log switches and the LGWR is consuming lots of CPU time. You have an idea of what the problem is and you begin looking at the information in V$BACKUP and in V$DATAFILE_HEADER. What do you suspect is the problem？（） A。 B。 C。 D。
润滑脂是基础油中（石油基础油或合成基础油）用稠化剂增稠，加入添加剂。
What are three relevant design considerations when using the 15216 EDFA? （）(Choose three.)
