属于锥形封头的有（）。 ["无折边锥形封头","折边锥形封头","凸形封头","无折边球形封头"]
基于数据挖掘的客户满意度分析的作用有（）。 ["分析客户的兴趣点","客户流失分析","挖掘影响客户满意度的重要因素，并重点改善","竞争对手分析"]
You need to perform certain data manipulation operations through a view called EMP_DEPT_VU, which you previously created. You want to look at the definition of the view (the SELECT statement on which the view was created.) How do you obtain the definition of the view?（） ["Use the DESCRIBE command on the EMP_DEPT_VU view.","Use the DEFINE VIEW command on the EMP_DEPT_VU view.","Use the DESCRIBE VIEW command on the EMP_DEPT_VU view.","Query the USER_VIEWS data dictionary view to search for the EMP_DEPT_VU view.","Query the USER_SOURCE data dictionary view to search for the EMP_DEPT_VU view.","Query the USER_OBJECTS data dictionary view to search for the EMP_DEPT_VU view."]
What is the output？（） ["300-100-100-100-100","300-300-100-100-100","300-300-300-100-100","300-300-300-300-100"]
认知发展心理学流派的代表人物是（） ["格赛尔","弗洛伊德","艾里克森","皮亚杰"]
行政行为
