某市根据河流规划拟在A江建设一水利水电枢纽工程，该枢纽工程位于西南地区。项目法人按照“三项”制度的要求，通过公开招标方式决定由某施工单位B承建。该工程以发电为主，同时兼有防洪、灌溉等任务。挡水建筑物为土石坝，水电站采用引水式开发方式。施工过程中，采取了隧洞导流的方法。背景资料中的“三项”制度指的是什么？
You are using the Database Resource Manager to manage database resources. You created a resource plan directive for the MANAGERS resource consumer group under the SALES_PLAN by using the following statement： SQL>EXEC DBMS_RESOURCE_MANAGER.CREATE_PLAN_DIRECTIVE （PLAN => ’SALES_PLAN’， GROUP_OR_SUBPLAN => ’MANAGERS’， CPU_P1 => 100， CPU_P2 =>0， SWITCH_GROUP => ’CLERKS’， SWITCH_TIME_IN_CALL => 600）； A user， SCOTT， who is assigned to the MANAGERS group， starts a database session and executes a query on the database. What is the outcome if the query takes approximately 15 minutes to complete？（） The query starts under the CLERKS group and the user， SCOTT， switches back to the MANAGERS group after the query completes.。 The query starts under the MANAGERS group but terminates with an error when the execution time exceeds 10 minutes.。 The query starts under the MANAGERS group and switches automatically to the CLERKS group when the execution time exceeds 10 minutes. The query does not switch back to the MANAGERS group after the query completes.。 The query starts under the MANAGERS group， the user SCOTT switches automatically to the CLERKS group when the execution time exceeds 10 minutes， and then switches back to the MANAGERS group after the query completes.。
当分部工程较大或较复杂时，可按（）划分为若干子分部工程。 专业系统。 施工楼层。 施工程序。 施工特点。 材料种类。
You plan to use Flashback Drop feature to recover a dropped table SALES_EMP. No other table with the same name exists in the schema. You query RECYCLEBIN and find multiple entries for the SALES_EMP table as follows: You then issue the following statement to recover the table: SQL> FLASHBACK TABLE sales_emp TO BEFORE DROP; What would be the outcome of the precedent statement?（） It retrieves the latest version of the table from the recycle bin。 It retrieves the oldest version of the table from the recycle bin。 It retrieves the version of the table for which undo information is available。 It returns an error because the table name is not specified as per the names in the OBJECT_NAME colum。
省、自治区、直辖市人民政府水行政主管部门依照管理权限，负责监理工程师注册申请材料的接收、转报以及相关管理工作。
一台50Hz三相异步电动机的转速为720r/min，该电机的级数和同步转速为（）。
