View the Exhibit and examine the steps that you executed to create a database resource plan. Subsequently, you execute the following procedure which results in an error: SQL> EXECUTE dbms_resources_manager.validate_pending_area ( ); What could be the reason?（）
A、 The pending area is automatically submitted after the plan creation
B、 The procedure must be executed before creating the resources plan directive
C、 The SYS_GROUP resource consumer group is not included in the resource plan directive
D、 The OTHER_GROUPS resources consumer group is not included in the resource plan directive
人（手）孔位置不应设置在（）。
A、建筑物正门前
B、货物堆场
C、低洼积水处
D、交叉路口
在执行语句SELECT department_id FROM employees，departments WHERE employees.department_id= departments.department_id；时报错，原因是（）。
A、没有给表employees和表departments加别名
B、没有给列department_id加别名
C、不能用employees.department_id=departments.department_id作为条件
D、SELECT后面的department_id没有指定是哪个表
简述色彩计划的特性。
（）是正确的E-mail地址。
A、mailto:Webmaster@ceiaeC.org
B、Wmailto:master@ceiaec.org
C、http：//www.ceiaeC.org
D、D.http：//www.ceiaeorg
在笛卡儿坐标系中，当X轴的正向向左，Y轴和正向向上，那么Z轴的正向应向外。
A、对
B、错