在接收人收到发送的信息时，由其本人或指定的代理人或通过自动交易系统向发送人发出表明其已收到的通知的是（） ["要约","承诺","要约邀请","确认收讫"]
What are the different logging modes available in Oracle Database 11g？（） [" NOLOG mode"," NOARCHIVELOG mode"," LOGGING mode"," HOTDATABASE mode"," ARCHIVELOG mode"]
国家对特定对象通过法律或行政手段规定其必须投保的保险叫做（）。 ["商业保险","自愿保险","强制保险","普通保险"]
按GB7588-2003《电梯制造与安装安全规范》规定，检修门的高度不应小于（）。 ["1.4","1.6","1.8"]
Your database is functional with a peak load for the last one hour. You want to preserve the performancestatistics collected during this period to be used for comparison when you analyze the performance of thedatabase in the future. What action would you take to achieve this task（） ["Insert finding directives for ADDM tasks in the future.","Create a baseline on a pair of snapshots spanning the peak-load period.","Decrease the snapshot interval in the AWR to collect more snapshots during the peak- load period.","Set the snapshot retention period in the Automatic Workload Repository （AWR） to zero to avoid automaticpurging of snapshot"]
近代中国城市发展有哪些特点？
