第18题: [多项选择]Which of the following files cannot be backed up by RMAN? ()(Choose all that apply.) A. Database datafiles B. Control files C. Online redo logs D. Database pfiles E. Archived redo logs 参考答案:C,D
第19题: [多项选择]粉料罐顶部冒烟() A. 粉料罐顶部积灰太多 B. 粉料满罐,从安全阀中冒出 C. 除尘器滤芯堵塞,粉料罐内压力升高到安全阀压力 参考答案:B, C