作为教育教学活动的手段的游戏，其直接目的不在于游戏本身，而在于通过游戏促使教育教学活动的有效进行。这种游戏称之为（） ["本体性游戏","过程性游戏","结果性游戏","工具性游戏"]
Your multitenant container database (CDB) contains pluggable databases (PDBs), you are connected to the HR_PDB. You execute the following command: SQL > CREATE UNDO TABLESPACE undotb01 DATAFILE ‘u01/oracle/rddb1/undotbs01.dbf’ SIZE 60M AUTOEXTEND ON; What is the result?（） [" It executes successfully and creates an UNDO tablespace in hr_pdb."," It falls and reports an error because there can be only one undo tablespace in a cdb."," It fails and reports an error because the CONTAINER=ALL clause is not specified in the command."," It fails and reports an error because the CONTAINER=CURRENT clause is not specified in the command."," It executes successfully but neither tablespace nor the data file is created."]
The variable df is an object of type DateFormat that has been initialized in line 11. What is the result if this code is run on December 14， 2000？（） ["The value of s is 14-dic-2000.","The value of s is Dec 14， 2000.","An exception is thrown at runtime.","Compilation fails because of an error in line 13."]
药物的作用是指（） ["药理效应","药物具有的特异性作用","对不同脏器的选择性作用","药物对机体细胞间的初始反应","对机体器官兴奋或抑制作用"]
You are managing an Oracle Database 11g database. You want to take a backup on tape drives of the USERS tablespace that has a single data file of 900 MB. You have tape drives of 300 MB each. To accomplish the backup， you issued the following RMAN command： RMAN>BACKUP SECTION SIZE 300M TABLESPACE users； What configuration should be effected to accomplish faster and optimized backups by using the above command？（） [" The SBT channel must be configured， with the default parallelism setting for the SBT device set to 1"," The COMPATIBLE initialization parameter for the database instance must be set to at least 10.0"," The SBT channel must be configured， with the parallelism setting for the SBT device set to 3"," The SBT channel must be configured， with the MAXPIECESIZE set to 300 MB"]
发电机失磁后其本身有何影响？
