Using the report wizard you create a tabular report to display all the columns in the EMP table. The records are ordered by the deptname and job columns. You need to create a hierarchical report that breaks on the deptname and job values. Using the data model how would you create this break structure?（） Specify the break order on the gemp group Property palette. 。 Specify a break order on the dept_name and job columns property palettes. 。 Click and drag the dept_name and jobs column out and above of the gemp group to create a new parent group. 。 Change the position of the dept_name and the job columns within the gemp group.。
在大接地电流系统中发生接地故障时，保护安装地点的零序阻抗角决定于（）。 该点至故障点的零序阻抗角。 该点至故障点的复合阻抗角。 故障点至背后零序网络中性点之间的零序阻抗角。
While creating a scheduler window using the DBMS_SCHEDULER package， a user logged in as DBMGR gets the error message insufficient privileges？ Which two commands would you use to resolve this error？（） GRANT dba TO dbmgr；。 GRANT connect TO dbmgr；。 GRANT resource TO dbmgr；。 GRANT hs_admin_role TO dmbgr；。 GRANT manage scheduler TO dbmgr；。
刀具在切削过程中，最主要、消耗动力最多的运动是（）运动。 主。 进给。 切削。 旋转。
Examine the following command： SQL> ALTER TABLE booking SHRINK SPACE COMPACT； Which activity is performed when the preceding command is executed？（） The shrink operation touches every block in the BOOKING table。 The high-water mark （HWM） for the BOOKING table is shifted from its original position。 The progress of the shrink operation is saved in the bitmap blocks of the BOOKING table。 The data manipulation language （DML） triggers on the BOOKING table are executed because the shrink operation is internally handled by the INSERT/DELETE operatio。
肌肉收缩时张力基本保持不变，但肌纤维长度缩短或延长称为：（）
