幼儿园管理的首要原则（） ["教养为主的整体性原则","民主管理原则","方向性原则","社会协调性原则"]
下面哪个功能键可以调出Delphi 的联机帮助信息（） ["F1键","F2键","F3键","F4键"]
目前采油累积量与地质储量的百分比称为（） ["采收率","采出程度","目前采收率"]
含剧毒气体组分（）的混合气体，称为剧毒性混合气。 ["不论浓度大小","0.1%以上","0.5%以上","2%以上"]
You are connected to a pluggable database (PDB) as a common user with DBA privileges. The STATISTICS_LEVEL parameter is PDB_MODIFIABLE. You execute the following: SQL > ALTER SYSTEM SET STATISTICS_LEVEL = ALL SID = ‘*’ SCOPE = SPFILE; Which is true about the result of this command?（） [" The STATISTICS_LEVEL parameter is set to all whenever this PDB is re-opened."," The STATISTICS_LEVEL parameter is set to ALL whenever any PDB is reopened."," The STATISTICS_LEVEL parameter is set to all whenever the multitenant container database (CDB) is restarted."," Nothing happens; because there is no SPFILE for each PDB, the statement is ignored."]
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