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【多选题】
观测器的类型有哪些？（ ）A.
现时观测器
B.
预报观测器
C.
降阶观测器
D.
闭环观测器
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反馈参考答案：
举一反三
【多选题】What is the purpose of the recover command？（）
A.
Recover database datafiles from physical disk backup sets.
B.
Recover required incremental backups from physical disk backup sets.
C.
Recover required archived redo logs from physical disk backup sets.
D.
Apply incremental backups to recover the database.
E.
Apply archived redo logs to recover the database.
【单选题】Heat exchangers
A.
recover up to 90% of heat that would otherwise be lost.
B.
recover over 90% of heat that would otherwise be lost.
C.
are difficult to use.
【简答题】A．offset B．disrupt C．restore D．relieve
【单选题】I could easily perceive that his heart burnt to relieve his starving kids, but he seemed ashamed to ______ his inability to me.
A.
discover
B.
recover
C.
demonstrate
D.
impress
【简答题】A. recover B. relax C. relieve D. remove
【单选题】Believe it or not, crying is a way you can imagine ______ pressure.
A.
relieving
B.
to relieve
C.
relieved
D.
relieve
【简答题】A．offset B．disrupt C．restore D．relieve
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