Which two are characteristics of user-managed backup and recovery operations？（） Recovery is initiated using SQL*Plus.。 Database files are backed up using SQL commands.。 Database files are backed up with Recovery Manager.。 Database files are restored using Recovery Manager.。 Database files are backed up using operating system commands.。
动机
Which of the following are automatically configured on the CallManager when entered on the CRS Application Administration?（） CTI port 。 CTI Route Point 。 agent skills 。 JTAPI user 。 CRS prompt language 。 ASR provider &e。
AFEB的频段属于（） 900MHZ。 1800MHZ。 两者兼容。
请简述饱和蒸汽压的概念及温度对其的影响？
设有一个栈，元素进栈的次序为A、B、C、D、E下列（）是不可能的出栈序列。
