You configured the flash recovery area in the database. Which two files would you expect to find in the flash recovery area?()
A. backup pieces
B. copies of all the parameter files
C. trace file generated using BACKUP CONTROLFILE TO TRACE
D. control file autobacku
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原子吸收分析中光源的作用是()
A. 提供试样蒸发和激发所需要的能量
B. 产生紫外光
C. 发射待测元素的特征谱线
D. 产生足够浓度的散射光
蔬菜水果中富含下列哪些成分?()
A. 脂肪
B. 蛋白质
C. 矿物质
D. 膳食纤维
E. 芳香物质