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?()
A. Use the DESCRIBE command on the EMP_DEPT_VU view.
B. Use the DEFINE VIEW command on the EMP_DEPT_VU view.
C. Use the DESCRIBE VIEW command on the EMP_DEPT_VU view.
D. Query the USER_VIEWS data dictionary view to search for the EMP_DEPT_VU view.
E. Query the USER_SOURCE data dictionary view to search for the EMP_DEPT_VU view.
F. Query the USER_OBJECTS data dictionary view to search for the EMP_DEPT_VU view.
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重力选煤主要利用物料密度差别进行分选。
A. 正确
B. 错误
()不是积极倾听者表现出的行为。
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B. 表示赞同
C. 讲话不要太多
D. 不断提问
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B. 白金客户
C. 黄金客户
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