在个体与环境的相互作用中,通过一定的程序和方法将获得的外部信息进行内部重组,以不断建构本身的知识布局、智能布局等综合素质的学习方式是()。
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An important tablespace of your database is dropped by mistake. You use the Flashback Database feature to retrieve the tablespace. You perform the following steps to retrieve the tablespace: 1. You log on to Enterprise Manager as SYSDBA. 2. You select the maintenance screen. 3. You choose Perform Recovery option on the maintenance screen. 4. You choose Whole Database in the Object Type drop-down list Perform Recovery: Type screen. 5. You choose Recover to Current Time from the Operation Type on the Perform Recovery: Type screen. 6. You provide the Host Credentials for a database user. on the Perform Recovery: Type screen. 7. You click the continue button. An information screen appears saying that the database is unavailable. What is this information screen?()
A. Recovery Manager
B. Recovery Window
C. Recovery Wizard
D. Enterprise Manager Home Page
解吸压力一般选择为0.2~0.25MPa,其选则依据是()。
A. 解吸压力愈低愈有利于解吸过程的进行,但又必须克服气体在设备、管道和阀门的阻力损失
B. 解吸塔顶部排出气含水量尽量减少
C. 解吸加热蒸汽压力为0.3MPa
D. 由解吸进液组成和温度决定的
用干粉、1211等灭火器扑救带电电气火灾时应注意哪些?
在起重作业中常用的环链是用圆钢弯制成椭圆形状焊接而成的。
A. 正确
B. 错误