The RECYCLEBIN parameter is set to ON for your database. You drop a table, PRODUCTS, from the SCOTT schema. Which two statements are true regarding the outcome of this action? ()(Choose two)
All the related indexes and views are automatically dropped
B. The flashback drop feature can recover only the table structure
C. Only the related indexes are dropped whereas views are invalidated
D. The flashback drop feature can recover both the table structure and its data
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累加器A采用的寻址方式有()。
A. 寄存器寻址
B. 直接寻址
C. 寄存器间接寻址
D. 立即寻址
完成市场预测的步骤第一步应是()。
A. 确定预测的目标
B. 建立预测模型
C. 搜集处理资料
D. 选择预测方法
燃油锅炉的回油调节阀的阀芯开度最大时,回油阻力小,则要油量为最大。
A. 正确
B. 错误
输油泵一般由输油泵体,喷油器,活塞,高压油管,回油管,油管接头等零部件组成。
A. 正确
B. 错误