简述微生物的主要特征。
If you back up a database without connecting to the recovery catalog， which operations will cause the recovery catalog to be updated？（） The next time you back up the database when you are also connected to the recovery catalog and the target database。 The next time you are connected to the target database and the recovery catalog database and issue the resync command。 The next time you connect RMAN to just the recovery catalog。 The next time you connect to the recovery catalog and the target database with RMAN。 Connecting to the recovery catalog and issuing the resync all databases command。
下列不属于隐性广告表现形式的是（） 网络新闻广告。 BBS广告。 搜索广告。 全屏广告。
You are installing Oracle Database 11g on a machine. When you run the installer， the Oracle Universal Installer（OUI） shows the message that says one of the product-specific prerequisite checks has failed：Checking available swap space requirements ...Expected result： 1512MBActual Result： 1018MB Check complete. The overall result of this check is： Failed <<<< Problem： The system does not have therequired swap space. What happens to the installation in this situation（） It can be continued.。 It resizes the swap space automatically when you proceed further.。 It can be continued， but the instance cannot be started without increasing the swap space.。 It shows a message saying one or more prerequisite checks have failed and the installation cannot proceed。
杜朗口三三六模式主要含义是什么？
在动火作业前，必须使用可燃气体检测仪监测可燃气体，浓度必须小于（）%。
