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[多选] Which two statements are true about mouse button variables?()

A . SYSTEM.MOUSE_BUTTON_PRESSED returns a string. 
B . SYSTEM.MOUSE_BUTTON_PRESSED returns a numeric value. 1Z0-132 World Leaders In Certifications Material - Test-king.com 
C . A possible value for SYSTEM.MOUSE_BUTTON_MODIFIERS is Control+Alt+Delete. 
D . SYSTEM.MOUSE_BUTTON_MODIFIERS can only be references in form-level triggers. 
E . SYSTEM.MOUSE_BUTTON_MODIFIERS identifies which special key was pressed in conjunction with the usual mouse button action.&e

Which two statements regarding a SQL profile are true?()  It is built by Automatic Tuning Optimizer.。  It cannot be stored persistently in the data dictionary.。  It can be used by the query optimizer automatically.。  It can be created manually by using the CREATE PROFILE command.。 社会保险经办机构可以与医疗机构、药品经营单位签订服务协议,规范医疗服务行为。 You are required to migrate your 11.2.0.3 database as a pluggable database (PDB) to a multitenant container database (CDB). The following are the possible steps to accomplish this task: 1. Place all the user-defined tablespace in read-only mode on the source database. 2. Upgrade the source database to a 12c version. 3. Create a new PDB in the target container database. 4. Perform a full transportable export on the source database with the VERSION parameter set to 12 using the expdp utility. 5. Copy the associated data files and export the dump file to the desired location in the target database. 6. Invoke the Data Pump import utility on the new PDB database as a user with the DATAPUMP_IMP_FULL_DATABASE role and specify the full transportable import options. 7. Synchronize the PDB on the target container database by using the DBMS_PDS.SYNC_ODB function. Identify the correct order of the required steps.() 2,1,3,4,5,6。 1,3,4,5,6,7。 1,4,3,5,6,7。 2,1,3,4,5,6,7。 1,5,6,4,3,2。 天然气脱硫是指脱出天然气中的() 硫化氢、二氧化碳、一氧化碳。 硫化氢、二氧化碳、有机硫化物。 二氧化碳、一氧化碳有机硫化物。 硫化氢、一氧化碳有机硫化物。 Because of hardware failure, you decided to drop a redo log member from the database. Which condition should be met to drop a redo log file?()  The redo log file should belong to an active group.。  The redo log file should belong to an inactive group.。  The redo log file should belong to the current group.。  The redo log file can be dropped only if all the transactions are stopped.。  Before a redo log file is dropped, it should be deleted from the operating system (OS).。 Which two statements are true about mouse button variables?()
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